@MKSA I have been working on this slowly but due to some personal things its had to take a back burner for a short while. Its had some major (and some minor) changes and is what I would say is nearly ready to build with the potential to be a very nice printer. A specific 'system' has been taking up a lot of my time (more than expected) but results are extremely promising from the test machinesby Ed3D - General
How does precision piezo work with a PEI bed - am I going to melt my PEI layer?by Ed3D - General
I might try laser cutting some acrylic corner brackets to hold them in place when tightening or even machining up a jig for it. I find even putting them on a flat surface they still kick up a bit but that may be because I’m using 5050 extrusion with self tapping trilobe screws that I find tend to jam and require a lot more torque.by Ed3D - Extruded Aluminum Frames
I think you misunderstand. I make this blind joints quite often at work because of how rigid they are over the corner pieces but my issue that I seem to often have is that when the bolt is tight it prevents twisting but when you are in the process of tightening it it quite often causes the extrusion to rotate causing it to be fixed at the wrong orientation.by Ed3D - Extruded Aluminum Frames
I would argue that the interlock should work in the opposite way that you want it to in this case. The logic being that you are trying to prevent injury by putting the machine into a safe state. For a CNC the main safety concern is crushing and cuts. This is relatively easy to prevent as when door opens you simply cut power to all axis (and spindle) and apply breaks to all axis (and spindle). Thby Ed3D - Safety & Best Practices
@ the_digital_dentist How are you preventing rotation of the extrusion as you tighten the bolt using the method you show on the first pageby Ed3D - Extruded Aluminum Frames
Nice! I like. I would love to see some thermal camera pictures of it!by Ed3D - For Sale
Thats true - max rotation of the heater-block you would need is 45 deg which at M7 x 1.0 would mean 125 microns so not a problem really!by Ed3D - General
Threaded mount looks good! How are you constraining rotation though? My concern is that the heater block will be at a random angle because of how the screw tightens up!by Ed3D - General
@ the_digital_dentist I quite like the stepped calibration pieces because it lets you quite easily work out your tolerances for fits and also classify exact what is an axis scaling error and what is not.by Ed3D - CoreXY Machines
That's a pretty big reduction for sure but is that better than you would get with a second screw? Although the deflection is interesting I'm more interested in the repeatability of the whole system, e.g. will that bed return to the same place when you move it. Try zeroing a dial on the bed then dropping the bed 10mm and raising it back 10 mm - does the dial zero out again? I fear the biggest isby Ed3D - CoreXY Machines
Nothing stopping you using Triangle labs stuff if that's what you prefer but I think its silly to say E3D haven't contributed anything. The only reason triangle labs can exist is because E3D make their designs publicly available. Also unless you're into spectroscopy or similar I wouldn't make claims about the alloys they use - for all you know its not even titanium!by Ed3D - Mechanics
2020 is my first thought but the carbon fibre will likely be stiffer and lighter. I dont think it matters too much at that kind of speed though but it would be nice to go faster. (CF also looks good!) They're actually very cheap (about £4 a meter!). Im not sure I follow what you mean about fusions sketching. My experience is mostly in Solidworks but I use NX a lot as well. I dont think part modby Ed3D - General
Id be interested to see what repeatability you get on that edge opposite the rails. Could you get a dial on it?by Ed3D - CoreXY Machines
QuoteRedemptioner the bore is perfectly smooth on both nozzle and heat-breaks unlike E3D.... The surface roughness of the heatbreak / nozzle is a critical feature of the breaks / nozzles performance. E3D have spoken about this before but having a perfectly smooth break isn't actually the best solution, there's a certain Ra value that seems to work best. I have just picked up a range of aliexprby Ed3D - Mechanics
I Think im going to go for the two rear rails - I cant see any major downside to them and the benefit of tucking the rails underneath the extrusion is worth it in my opinion. Shame because I liked the symmetry of the central rails. Quotegmedlicott The outer Z bracket dimensions also look good, enough to compensate for slight rail miss-alignment but still stiff enough. The brackets are going toby Ed3D - General
I've been working on the Z axis design, adding some brackets etc. It uses two central beams down the frame to hold the rails and then the three lead screws. I guess the extra extrusion will add a touch more rigidity to the frame but at this point its probably not going to have a huge effect. One of the compromises of the central beams is that the rails for the Y axis need to rotate 90 deg and facby Ed3D - General
QuoteMKSA None of them in fact. Explained in previous posts. "careful design" ? Please show. As I said in my previous post which it looks like you didn't actually read yes, springs are a viable option for tensioning a belt. In fact I can name 3 industrial machines right off the top of my head that use a spring to tension a GT2 belt and they are all capable of sub micron positioning at up to 1Gby Ed3D - Mechanics
QuoteMKSA QuoteEd3D You can use springs to tension belts and it will have an effect on the vibration damping and many high-end machines (not printers) do. The spring can be used to easily apply a tension to the belt and maintain tension as belts stretch so less servicing is required. There are three key issues with the springs that clip around the belts though which are: 1. The spring rate is FAby Ed3D - Mechanics
You can use springs to tension belts and it will have an effect on the vibration damping and many high-end machines (not printers) do. The spring can be used to easily apply a tension to the belt and maintain tension as belts stretch so less servicing is required. There are three key issues with the springs that clip around the belts though which are: 1. The spring rate is FAR too low, they areby Ed3D - Mechanics
I agree with what imqqmi says - you might be better off with a CNC router or even a laser cutter. You can clean up sharp edges on a CNC pretty easily with a chamfer mill.by Ed3D - General
Quotegmedlicott I like the maglev 2020 X axis! Me too - Design is so much easier when all the parts are maglev. The current plan is to print a bracket thing that holds the 2020 and the idlers. Quotegmedlicott A note on the frame extrusions, 3030 is obviously stiffer than 2020, but compression or torsion is not the main concern here (for the cubic outer frame), racking is. 2020 extrusion withby Ed3D - General
I'm kind of concerned about the hot end wobbling / not being as rigid if its clamped through the piezo. My other concerns is how the fillament guide would no longer mount to the hot end and so is pushing through the piezo too so extrusion / retraction will trigger the sensor? Maybe I'm misunderstanding on this one! Is the Orion better / more rigid than the simple disk? Could I integrate the Oriby Ed3D - General
I've tried working in some of the suggestions people have made and have come to this new design: The main changes are: Removed frame brackets Changed to curved extrusion - because they look nice X Axis now uses a 2020 profile as a backing 2 Z Rails, 3 Leadscrews Considering using piezo instead of BLTouch (for packaging mainly) Considering switching to the threaded V6 instead of groove mounby Ed3D - General
@ Moriquendi How close does the disk need to be mounted to the hot end? Can I put it between the carriage and the Y axis or does it need to be right above the hot end? Edit: Like this:by Ed3D - General
@Moriquendi Ok sounds good to me. If you could stop making me want to buy more printer related things that would be great though I've only really briefly looked into the piezo - I assume there will be some good mount ideas kicking around on the internet. Ill be probing onto glass if that matters?by Ed3D - General
Is there any negative to using F695 idlers on the toothed side of the belt? Im concerned that it will damage the teeth or is it not an issue?by Ed3D - Mechanics
QuoteMKSA Is the acceleration in the Z direction ? Etc... ah - I see the confusion, I've mixed up my axis as I typed up my response. Weight acts down in Z as does gravity, acceleration in Y. The CAE package I use uses Y as the vertical axis so when typing up I forgot to convert back to sensible axis. QuoteMKSA Anyway, at least you seem to give up on the cut wood/plastic sheet to reinforce theby Ed3D - General
Ive been thinking about the Piezo and the BLTouch for ages now, and have just ordered a BLTouch but would like to try the Piezo as well. My concern is how do you overcome the sources of error like if filament is stuck on the nozzle? And how does the physical probing effect the nozzle life? Could I use a piezo disk by placing it over the thread of the E3D threaded heatsink?by Ed3D - General
I'd vote duet Maestro - its' basically a duet wifi but cheaper. It supports everything you want except marlin. Im going to guess you want marlin because thats what you're used to? But RRF is much better on 32 bit controllers and I personally thing its much easier to setup and use. I think the Maestro is actually going to slightly break your budget but in the long run will probably be cheaper beby Ed3D - General