I was always under the impression that we watch stepper temps on the CNCs because of the PLA prints not because of damage to the steppers. I’m assuming that is correct from what you are saying here.
@azab2c sounds like you will need to print all your parts from ASA or something like that. that takes the temp way above standard 60°c chamber temps. I will be doing the same lol.
I agree with this. If you insulate it too well you wont be able to evacuate enough heat to easily print and cool PLA. For no more often than I will print the hotter stuff just a standard polycarbonate panel or even 1/4" plywood will work for my needs. Plus I’ll just add a $20 chamber heater like @niget2002 did
I am pretty indifferent to the location really, I think we let this one sit and see how many offer up an opinion through the day. Maybe I can get a rough CAD sketch to see what that actually looks like.
The back seems super clean, less efficient but super clean. A little harder to deal with…but clean is nice. Front is easy
Rough mockup of what I was trying to describe earlier. Probably needs to be crowned with sections of extrusion and/or another 1/4" plate/strut/angle-bracket to help the printed parts resist being pulled in by the belts…
Was trying to push the belt and steppers out closer to exterior. Leaving 1/8"+ for polycarbonate lid. No idea if this arrangement make sense?
Removable optional inner chamber honeycomb blinds for super efficient, and/or hot prints is a separate thing… But blinds would mount to reference plate at top, and a larger square bed support plate.
12mm clearance around Steppers where possible for Alu heatsinks would be nice.
I am not seeing how you are going to isolate the top from the bottom.
Some sort of 4 way moving shield at the nozzle?
But again, why?
First google hit for nema 17, " This motor is desighed for high temperature application. We have customed motor’s winding, bearing, magnetic steel and also the plastic skeleton to achivel insulation class of H, the teprature reach up to 180C degree."
Main goal for this layout was smaller overall XY footprint. Easier squaring and assembly.
Didn’t realize printed part temp is the limit, and not stepper. Using ASA parts solves that for most higher temp materials, IF people planning to print high temp material. Am ignoring v.high temp like Peek.
Me neither. I haven’t thought about 4 way shield, e.g. left and right X blinds, and front/rear Y blinds stacked on top above the belts attached to edges and core.
Reducing energy needed to heat chamber for higher temp materials. Minimize or avoid chamber heater even.
I sit close to the printer, the room gets hot during long prints.
Edit: Just remembered keeping regular steppers below 80c helps avoid magnets demagnetizing, good for longevity/performance? Didn’t realize we’re using high temp rated for 180c.
We are not using any special steppers. I have no idea what they can handle I am sure at least 80C. I can’t imagine you would try to actually keep your chamber at 80C?, what do you need the chamber temp to be.
As I said we are not making this as a extreme chamber but I am trying to accommodate your wants. So what is the chamber temp you want to use for ASA?
E-Brake update. The relay seems to work perfectly. The steppers power on just fine and work as expected. Kill the power and the are still holding. It seems the relays power down before the SKR by a split second. I feel zero drop at all except the slight give it has after power down, the smooth slide.
We are going to call this Plan B, Mike has another idea that could be even better. I will open another thread to discuss it there. E-Brake for Belted Z axis
No we can still cross them in the back. We can put a stepper anywhere there is currently a idler. we can even add one in random places as long as it is not where the belt is variable length. (we can add one in the middle off the side if we want)
I just tested it shorting one coil on one stepper with a 16T pulley it hold 4 lbs, it holds 5 lbs for a couple inches then slips.
So with one “brake” on each Z stepper we can easily hold 4 lbs each.
Shorting both coils should hold more (nearly double?)?
So we have a target. your bed stack needs to be under 12 lbs or you need twice the brakes.
I just weight 3 steppers, 305x305mm 1/4" aluminum plate with a header and am sitting at 6.5lbs. (how the heck is your bed more than twice that JJ?!?!?!)
I think staying under 12lbs should be fairly easy for a standard build.
add another 1/4" aluminum for the brace, and at the 10.5 lbs I had a 310x320 glass bed on there as well. I did weigh that separate and its 2lbs on its own. That’s off now so I should be at 8.5lbs lol
