How do you choose the best material for your application.
      The table above, is the average of our measurements of actual 3D Printed test parts for the noted polymers.  As any extreme of a polymer get's close to the orange center-line, we must pay special attention and or be more specific as to the desired intent of the end part.  As a point of reference, a rubber-band would be on the left and have little Tensile, but a considerable elongation/stretch/bend.  On the other end, we would have window glass.  While window glass has a tensile of ~9,000PSI, it has zero elongation, i.e. it will crack easily.  ABS is often used as it has a general combination of reasonable tensile, but with enough elongation so as not to disintegrate when put in a mild strain.   Another common 3D Printing material is standard PLA.  As noted above, we are giving up elongation for tensile.  The end PLA part "feels" hard, but it's also very brittle. 
From the list of materials we can denote some potential uses.

Nylon 680 = Nylon 680 was developed at taulman3D to meet certain FDA criteria for clinical and other applications.
Potential uses:
There are many uses in the clinical, food and medical industries.  As any material needs to be fully tested for each use, it will be several months before testing is complete and certified uses are noted.

Alloy 910 = Alloy 910 is a significant development by taulman3D and both our chemical house and post processing company.  The goal was to provide a super material with very high tensile, yet sufficient elongation to maintain a high degree of durability.  Alloy 910, when 3D Printed comes in at 8,100 PSI Tensile and close to 12,000PSI when injection molded.
Potential uses:
Any industrial parts that are currently being made of other high tensile polymers.
Large motor mounting
Industrial vibration isolators and damping parts
High Pressure Sand Blasting resistant
Sand Blast Masking
Electroplating supports and hangers
Chemical dip and tank supports.
High end gears and cams
Chemical resistant equipment covers.

T-Lyne - T-lyne is a unique, crystal clear polyethylene co-polymer isomer developed specifically for high durability, flexibility, unique viscosity and a wide temperature range.   Glass-like aesthetics can easily be obtained at high layer sizes using low speed and low temperatures in the range of 190 C to 210 C.  Utility style parts are easily printed faster at standard layer sizes using higher temperatures up to 245 C, depending on nozzle size.
Potential uses:
Clear bottles, lids and containers
Post print mold-able features
Extreme Impact resistant parts
Living Hinge parts
Stretchable parts

Additional notes:
1. Only Nylons should be used for gears, etc where a slippery surface is desired.  All other materials will scratch against each other creating a plastic dust.  And eventual failure.
2. The scale above is for 100% infill of parts.   Reducing infill % and number of perimeters will have a tendency to reduce Tensile, yet increase elongation.
3. Nylons do not crack/shatter, but will eventually compress and fold during severe over-stress.  t-glase and TECH-G will not shatter, but can break along and against layers.  Alloy 910 can either fold/compress or crack depending on part design.  An excellent feature of Alloy is that Support material easily breaks away, yet durability is retained!
4. Nylons can be threaded using std TAPs and drilled directly without creating cracks.  t-glase and TECH-G can also be tapped.  When drilling, use a pilot hole close to the desired DIM.  
5. Only use Nylon 645/Bridge or Alloy 910 for Sandblasting masking or similar applications.  Most other materials will be destroyed in seconds.
6. For parts to be used outdoors, use a UV coating.
7. For High temperature Nylon, use Alloy 910 or Nylon 680.  For High temperature co-polyester, use BluPrint.  

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