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Dubbed "Bridge" by our local St Louis testers as bridging the strength of nylon 645 together with the price of current ABS and PLA thermoplastics, allows any user the flexibility to determine the best choice in material for their printing needs. From our customers, we have logged and prioritized the most sought after features of a high strength printing material.
Starting with our strongest base polymer used for a percentage of nylon 645, we began working all of these requests.
First, was the adherence to the Printing platform. Those that follow the use of nylon in posts, blogs and 3DP discussion rooms know of using garolite (LE) as a print surface. While this works well for all of taulman3D nylons, garolite is not always easy to acquire and even so, requires a properly cut section that fits each user's unit. Our thanks goes out to our chemical company for helping to change this requirement. The surface properties of most nylons is extremely slippery making adherence to the printing platform difficult. Our chemical company was able to make minor adjustments, to reduce the surface effect just slightly, thus allowing for the use of most PVA glues, either full strength or diluted. Initial testing shows that in some cases, the PVA was better with Bridge than garolite is with 618. Thus, some dilution was used. The specific PVA used in our labs is a very low cost "ELMER'S Glue-All" White PVA.
Next was Reduced water up-take from local humidity. While it is not possible to eliminate the water uptake by nylon, it is possible to localize it to the surface through final processing changes. Therefore when printing, rather than water creating a subtle popping that can effect the surface finish, Bridge will hold the water to the outer portion resulting in a slight steam when wet. The result of this is that Bridge needs little or no drying in the winter and just needs to be warmed in the summer months. This is a manufacturing process that our extrusion house developed and added to our existing taulman3D processes.
We found that the same process that reduces water uptake also helps to reduce shrinkage. While nylon will always have a slightly higher amount than ABS, we were able to reduce it to an in/in value less than our current nylons. These changes also led to a slight reduction in stringing as the extruded threads are a thicker melt.
Non-destructive evaluation of 3D Printed parts is a function of the transparency of Bridge. Like nylon 645, this transparency allows for visual inspection of printed parts. This is a combined request from our industrial and clinical customers. As noted early on, parts can be printed "too fast" for some polymers. While the outside of the part may look acceptable, a part printed too fast will not have internal fill material that actually adheres to the inside of the perimeter. With Bridge and nylon 645, Non-destructive evaluation is a simple visual verification.
With this combination of advancements, taulman3D proceeded with a limited test run. From this initial test run, we printed test samples to be sent out to the St Louis test labs. A fully accredited testing facility supporting the central US. The lab reported a Tensile Stress PSI of 4,800 for Bridge when 3D printed. See below.
taulman3D supports several industrial, commercial and clinical customers with nylon 645 and this has allowed us to meet all of our pricing tiers for certain chemicals used in 645. Because 'Bridge" is a very close chemical polymer to nylon 645, we are able meet these pricing requests.
Both Nylon and t-glase will NOT seize in your hotend even if left in place with heater "ON" for 72hr's. Both will oxidize and extrude soot upon reactivation. 150mm of purge is all that is required to begin printing anew.
1. Manufacturer ID is self assigned and used for Production and shipping references.
2. Based on an average of reported values. Nominally 5C lower with SeeMECNC and E3D HE's due to their structures.
3. Note on t-glase…If the platform cools faster than the part, then a glass platform may suffer cracks. Tg on Nylon can be missleading due to nylon's structure.
4. Pyrolysis is basically "Boiling"….Check your thermistor!
5. Print Bed temperature for nylons is a function of reducing the "shock" from layer to layer. Shock is defined as the time between layers such that the temp diff is at it's greatest.
6. Small parts in t-glase need a fan on the part being printed due to it's Tg.
7. Moisture plays a strong part in shrinkage. Less moisture = less shrinkage.
8. To adhere nylon to nylon, use a soldering iron.
9. Testing performed by St Louis Testing Laboratories Unit = 5500R Instron with Bluehill Software…. ASTM D412-0a E2 5 pc's printed at rated temperature Bars are .1314" thk 1 perimeter All surfaces (no fill, just surfaces) 45 degree surfaces.
10. As natural is not a specific color, we are working on a Pantone equivalent.
11. Living hinge is using the material flexible properties as a hinge assuming 2000 90 degree transitions.
12. As nylon will take on water, only air cooling should be used.