Correct - not an issue (even when throwing >1Kg around). Oh, and that's with 6mm belts. I had at one time considered using 9mm but as belt stretch isn't an issue using 6mm belts, there is no point.
I'm planning on doing some tests but my gut feel is that there may be some stretching when the belts are initially tensioned, but once tensioned, the incremental load applied in order to accelerate the hot end is not sufficient to cause any further stretching.
It might be less work to build an insulated frame with a decent chamber heater that try and retrofit a printer inside a toaster over. they may prove to be a cheap source of heating elements for the chamber heater though.
I can recommend the website www.aluminyumburada.com for aluminium tooling plates / print bed base. Their unit price is cheaper than clickmetal, but their shipping prices higher since they are based in Turkey. So depending on where you are, this could be an interesting option. This is essentially the same product as Ecocast.
After a long time not managing to finish off my version of a 3mm extruder using Bondtech gears, I ended up buying a Orbiter v1.5 and modifying it for 2.85/3mm filament. This was pretty easy, just drilled out the filament path to 3.5mm and fitted the hobbed gears from a Bondtech DDG (available separately, too). Works well and is tiny! Here it is printing a Benchy on my old-school bed-slinger.
And yes, I should probably clean up the rusty rails and bearings...
@Phaedrux I'm thinking of doing 3Z similar to your setup but driven by 3 motors since I can use spare extruder motor on duet 2 for third motor. But as you mention the bed does not go out of level so often hence not really motivated to mess with it for now just for autoleveling 🙂
if its fine at the front but not at the back then the issue is with your bed levelling not the offset.
This is the macro I use for levelling my bed on my ender 3
M671 x29:198:29:198 y35:35:204:204 P0.5 ; The location of the four bed securing screws
G28 Z ; Home Z
G30 P0 X29 Y35 Z-99999 ; probe near an adjusting screw ; Front left screw
G30 P1 X198 Y35 Z-99999 ; probe near an adjusting screw ; Front right screw
G30 P2 X29 Y204 Z-99999 ; probe near an adjusting screw ; Rear left screw
G30 P3 X198 Y204 Z-99999 S4 ; probe near an adjusting screw ; Rear right screw
G28 Z ; Home Z
Run this and it will tell you how much each corner needs adjusting.
Good point, I'll make a testprint with a part placed along the rail in question. It's also a good ringing test.
The belts are all on one side, I hope that keeps the extruder-mount from twisting, too.