Revision as of 18:52, 7 May 2020

Extruder Driver Calculations

5 mm drive radius on drive means - about 20 lb drive
Measurements: about 10 lb before filament slips; motor does not skip before slipping, so tensioner is the limiting factor
Note push is very easy with full melt (from standing extruder upon startup). This implies, that under the limit of good heating, it is kinking of filament in 'mystery zone' that requires much of the push force.
Say teeth grab at 1 cubic mm of volume. 1/25^2 = 8 lb of 5000 psi filament. Thus, max push before stripping is about 10 lb. We have 2x that in the drive motor already.
Thus, geardown is calculated to not be needed, as we run into filament stripping limit.

18x18x17" (D3D v20.04.27) of plastic weighs 90 kg!
For practical purposes, only half of that would be a useful print assuming you have some geometry at 100% infill beyond a simple cube. 45 kg. But - if you are printing 2x4s or many verticals at 100%, you can indeed get close to 100% of the 90kg. Thus, leave 90 kg as the max. That would be a 10 day print with Supervolcano.
That is 200 lb.

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 *Say teeth grab at  1 cubic mm of volume. 1/25^2 = 8 lb of 5000 psi filament. Thus, max push before stripping is about 10 lb. We have 2x that in the drive motor already.
 *Thus, geardown is calculated to not be needed, as we run into filament stripping limit.
+=Bed Lift Capacity=
+*18x18x17" (D3D v20.04.27) of plastic weighs 90 kg!
+*For practical purposes, only half of that would be a useful print assuming you have some geometry at 100% infill beyond a simple cube. 45 kg. But - if you are printing 2x4s or many verticals at 100%, you can indeed get close to 100% of the 90kg. Thus, leave 90 kg as the max. That would be a 10 day print with [[Supervolcano]].
+*That is 200 lb.