September 28, 2020
3D PRINTING WITH THERMOPLASTIC POLYURETHANE (TPU) FILAMENT
THERMOPLASTIC POLYURETHANE is a form of elastomer, capable of being used on any properly equipped FDM 3D printer. Read full blog to know more
What is Thermoplastic polyurethane (TPU) Filament?
THERMOPLASTIC POLYURETHANE (TPU) is a form of elastomer, capable of being used on any properly equipped FDM 3D printer. In 3D printing service, TPU 3D printed parts are durable and have the ability to withstand ambient temperatures.
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3D printing TPU
For the first time, online 3D printing with TPU filament can be challenging. It is harder to print because of its elastic properties, making it more difficult for the extruder to press through the hot end. Ensure there are no gaps in the path of the filament from the extruder to the hot end. If possible, use a Teflon tube to direct it.
How do you work with TPU?
To better understand Thermoplastic Polyurethane (TPU) and its applications of 3D Printing in India, it might be useful to look at its practical predecessor, Thermoplastic Elastomer (TPE). TPE was the material of choice for lightweight printing materials until a few years ago.
THERMOPLASTIC POLYURETHANE (TPE) is a kind of plastic with rubber-like properties in online 3D Printing services. It can be extended to double its original length and then returned to its original shape without permanent deformation.
The softness of the TPE filament, on the other hand, found it tough to deal with. With a shore hardness of just 85A, TPE filaments had a propensity to be improperly treated by extruders that were not made for flexible filaments.
In 3D Printing online, TPU is a newer and firmer version of TPE. TPU has a more outstanding balance of elasticity, rigidity, and stability by incorporating low polarity segments (or flexible segments) and high polarity segments (or heavy segments) into a single polymer strand.
The finished product has a marginally higher shore hardness of 94A, making it simpler to treat with the 3D printing extruder mechanism.
When dealing with flexible filaments in 3D Printing services in India, it is better to consider using direct extruders. As previously said, the length of pipe that the filament must traverse in a Bowden extruder complicates the method. Working with a Bowden extruder is still possible, but extra fine-tuning of the printer’s settings might be needed to achieve successful performance.
More modern 3D printers of 3D Printing online that use Bowden extruders have been developed to minimize issues with flexible filaments. If you are confused about your printer’s features, check with the 3D Printing services vendor and see if your model is compatible with flexible filaments.
Extrusion temperatures of 200 to 220 °C are recommended for TPE filaments in 3D Printing in Bangalore. We still advise using a heated bed platform with a temperature range of 80 to 100 °C.
TPE has excellent adhesion properties in online 3D Printing India, so surfaces like glass or aluminium should be no concern. We also consider using Kapton Tape or blue painter’s tape for the best performance.
When dealing with lightweight filaments, it is best to print at very slow speeds. Flexible filaments bend and contract when stressed, so printing quickly would most certainly clog your extruder.
A setting of 15mm/s is preferred, but you can print at speeds up to 30mm/s with good performance. This will vary depending on the model you’re using, so start with a low setting and work your way up to see what works.
Since flexible filaments are less resistant to warping during 3D printing Bangalore, you may use a cooling fan in a medium or high environment. This allows you to keep fine detail on your prints without sagging or sloppy melting. We also suggest not using a cooling fan on the first two layers to ensure excellent bed adhesion.
Retractions are often needed when the design calls for the extruder to travel long distances without printing. On the other hand, retractions can be especially difficult when using flexible filaments because they are vulnerable to rapid movements.
We suggest turning off retraction entirely, mainly if this is your first experience using flexible filaments. If you can’t stop it, you can set a very slow retraction speed or reduce the need for retraction in your design.
- More rigid
- Easier to extrude and use
- Fatigue Resistant
- Flexible
- Excellent vibration dampening
- Long shelf life
- Good impact resistance
- doesn’t require a heated bed
- medium-strength material
- very high flexibility
- durability
- Minimal warping and shrinkage
- Very high Abrasion resistance
- Minimal Fumes
- Recyclability
- Ease of colouring
- Rubber-like elasticity
- Resistance to abrasion
- Pleasant tactile properties
- Easier to handle than TPE
- Excellent layer to adhesion
- Suitability for bonding and welding
- Resistance to oils, greases and solvents
- Excellent low-temperature and impact strength
- Good flexibility over a wide temperature range
- Robust weather and high-energy radiation resistance
- Not soluble
- Hygroscopic
- Not food safe
- Slower in printing
- Difficult to print
- Poor bridging characteristics
- Possibility of blobs and stringing
- May not work well on Bowden extruders
- Flexible filaments are made which are a blend of hard plastic and rubber.
- Used for Custom phone cases
- Used for Rubber mats
- Used for tires or shock absorbers
- Used for O-rings and seals
- Used for sporting goods and footwear
- Used in Aerospace industry
- Used in Automotive industry
- Used for photographic film
- Used for phone case
- Used for Cable ties
- Used for Golf discs
- Used for Cable sheathing
- Used for Medical tubing
- Used for Seals and gaskets
- Used for Industrial parts
- Used for Tool handles
- Used for Spiral and pneumatic tubing
- Used for Calendaring
- Used for conveyor belts
- Used for hydraulic hoses
6 Things to remember while 3D Printing with TPU Filament: –
- Use Direct Drive Extruders
- Reduce Resistance from the Filament Spool
- It is highly recommended that you use a consistent feed rate that is slow when 3D printing flexible filaments. The elasticity of TPU filament makes it uncontrollable while printing at a higher speed.
- It is recommended that you use negative tolerance between the parts.
- Do not use rafts when using a flexible filament like a TPU material for 3D Printing service in India because the base layers of the raft have a higher rate of extrusion which could lead to problems.
- Due to its elastic nature TPU is sensitive to fast movements such as retractions. Hence it becomes important to optimize the retraction settings to limit the movements and be successful in 3D printing in India. It’s best, to begin with a small amount of retraction while using a slow speed to help with any possible oozing from the extruder (hot-end).
The biggest disadvantage of using flexible filaments such as TPU by 3D Printing companies is the additional difficulty in handling them during printing. As previously said, not all 3D printers are capable of using flexible filaments.
Bowden extruder printers are especially troublesome. On the other hand, newer versions may have already taken steps to make them more compliant with flexible filaments. TPU’s firmer nature should allow it to be used in a broader range of applications.
THERMOPLASTIC POLYURETHANE (TPU) can also exhibit weak bridging properties, resulting in prints of many blobs and stringing. To get a decent quality printout of the flexible TPU, 3D Printing companies Bangalore would need to find the “sweet spot” of the combination of printing temperature, printing speed, and retraction speed.
Another disadvantage of using TPU in 3D Printing in India to create prints is that they cannot be completed to achieve a polished and flawless appearance. TPU, unlike PLA or ABS, does not dissolve in basic chemicals such as acetone. TPU 3D printing online is very much a case of “what you see is what you get.”
Pro tips for success
Where necessary, use a resealable container or a silica gel pad. Most flexible filaments are hygroscopic in some way and can pop and sizzle if extruded wet. There are water pockets that quickly steam up, leaving voids in your print.
For flexible materials, a few changes to your spool holder can also make a huge difference for your 3D Printing service. Mount the spool above the printer so that the filament unwinds downward, which will minimize resistance. If necessary, mount the spool’s hub on a bearing to enable the spool to rotate as freely as possible.
To stop binding or wrapping around your extruder gear, TPU should be printed at a much slower speed than ABS or PLA in 3D Printing services in India. There may be printable files available for your printer to help deter this from occurring.
Turn off retraction totally for the whole print. Constant retraction can result in under-extrusion in your print due to pressure being released in your hot end. Retraction also enhances the risk of the filament winding around the extruder gear in the middle of a print. This can result in minor stringing, which can be quickly removed with a lighter.
Using a lower layer height significantly increases the likelihood of a clogged nozzle. Increase the layer height to 0.3mm. This will cause the TPU to flow freely and continuously. TPU is perfect because it melts together to form a smooth and solid component even with greater layer heights.
In online 3D Printing services, TPU filament adheres to most build surfaces. There’s no need for glue or hairspray. Level the bed a little higher than average to prevent the nozzle from dragging over the soft first layers.
What are the types of TPU Filament?
Flexible Thermoplastic Urethanes (TPU) filaments used in 3D printing services vary in Shore A from 60 to 90 and are graded as ultra-flexible to semi-flexible. Depending on the application, there is a flexible filament with the properties needed to satisfy the needs of its users.
The most rigid-flexible filament is a semi-flexible TPU with a Shore A durometer of 90. (90A). This material is perfect for learning how to print flexible filament because its hardness mitigates its shortcomings.
A Shore A 90 material is considered stiff and, depending on the infill, can be printed rigidly while retaining flexible properties. It is an excellent material for when a degree of flexibility is needed while maintaining structural integrity, and it can be successfully printed on a Bowden-type extruder.
The most common flexible filament for affordable 3D Printing services is a Flexible TPU with a Shore A Durometer of 85 (85A). A Shore A 85 material is considered medium-hard, but it is very lightweight and provides a wide range of flexibility based on infill.
Although an 85A flexible filament can be printed on a Bowden extruder, the steep learning curve necessitates a well-optimized setup. It is suitable for gaskets, grippers, hinges, and RC tyres and accessories.
The most flexible filament in 3D Printing Bangalore is an Ultra-Flexible TPU with a Shore A Durometer of 60. (600A). A Shore A 60 material is graded as medium-soft, but it is highly flexible, even when filled to a high degree.
To print with it, it is strongly advised to use a well-configured direct drive extruder or a Diabase Engineering Flexion Extruder. Overprinted sections (such as rigid modules with integrated gaskets) or soft robots are suitable applications.
What is the compatibility of TPU Filament?
TPU filaments are compatible and are usually safe in many applications depending on several factors, they are even used in biomedical cases with a good 3D Printing quote.
A TPU filament is an adaptable compound and is commonly used in everyday lives. However, it is also the reason for many environmental issues due to its isocyanates content which is released by PUR based products.
It can cause irritation in the eyes, nose, and throat. It may also cause breathing problems and other health problems that can lead to blindness, disabilities or death.
FAQs
TPU stands for Thermoplastic Polyurethane. TPU is a softer and more compact alternative than other 3D printing filaments.
TPU differs from rubber in that it is heated and cooled before being vulcanized, whereas rubber is vulcanized. Rubber, on the other hand, cannot be recycled. As a result, businesses are attempting to discover new applications for old tyres, such as shredding them and using playground material as a substitute for sand.
TPU is used in a variety of areas. It is not a filament as used outside of 3D printing in India. TPU is used to produce phone covers, soft insulating material around cables, drive belts, caster wheels, and various other products.