D3D v20.04 Data Collection
- DRV 8825 is used for more current on Z. 
- Initially, one side motor on Z was 44 mm long (17PM-K402-P4V Minebea Motor Mfg Corp, V and A not shown), and the other was 48 mm long (17PM-K402-P5VS, 3.9V 1.3A). *Small motor was easy to stop - pound or 2, whereas larger motor was more like 10lb to stop.
- Extruder - at 11C from 11C to 230C - 2:15
- Bed - 2:47 at 11C from 11C-100C, 20C hysteresis at top
- Print volume - 12x12x10 inches - 1440 cu in - or 24 lb max weight of print. Bed can be lowered to attain 12x12x11 or more print volume.
Bed Weight Holding Capacity
- From D3D v20.04 Calculations, bed is 12 lb, and we should be able to lift a total of 40 lb withe the stepper motors - so an additional 25 lb.
- Weight of 1/8" steel plate, 8x8" - 2.3 lb. 10 or 11 of these should be held up.
- 3 could be held up reliably. So 7 lb of print mass - 3 spools of filament.
- Up to 6-7 could move up a little, but then they slammed down once the DRV8825 got hot.
- Need to redesign for 1000F max temp. Currently it's designed for 1200F.
- Redesigning for 430W each by lengthening 24 ga nichrome to 20' from 14', yielding max 850F temperature of element.
- Had default at 2 mm at 40 mm/s retraction at 1.2 nozzle.
- Increased to 4 mm - first clog ever. Reduced retraction to 3 mm
- Either more Z motors for better balance - or counterweight - are useful for handling the heavy weight of the bed. Motor skip upon going all the way to the top of bed in Z direction.
- Z motors will provide better balance if there are 4 corners of them. This will stabilize print quality.
- But also, another option is wider z parts. But this gets away from the natural modularity of the system.
- Added cost of 2 motors is about $50 for 2 axes.
- Added cost otherwise is a counterweight, which is lower cost.
- Less design change is favorable for going with 4 motors - the main case being for stability (larger weight handling is also a plus but secondary)