I'm getting kind of pissed off at the number of corners cut on this kit. The Y-bearing holder prints I received were extremely inconsistent. The shortest was 17.6mm and the tallest was 18.7mm which made bed leveling impossible. I shimmed the bearing holders to fix this issue. Now one of the linear bearings has completely seized and a second one has somehow become extremely loose (0.5mm+ of plby 691175002 - Prusa i3 and variants
QuotematteatschickenHere's a question hopefully someone can answer: on step 5, attaching the upper frame, are the two vertical pieces of 2020 supposed to be 90 mm from the very back outside edge of the printer or from the inside back edge? The photos in the guide make it look like it's from the inside back edge, or 110 mm from the very back outside edge. It doesn't actually matter since there isby 691175002 - Prusa i3 and variants
The chances are that you assembled the printer such that the X and Y axes are not perpendicular.by 691175002 - Prusa i3 and variants
I've been playing with a thermocouple and have noticed that the supplied thermistor configuration reads about 20c too low on the extruder. Is this just variance among the thermistors or are they using the wrong lookup table?by 691175002 - Prusa i3 and variants
Doesn't really matter. The belt isn't the weak point, any any stretch will be minuscule compared to backlash in the tooth pitch as well as compliance in the stepper/printer. I calculate expected belt stretch in a 3d printer as roughly 0.000003" from the numbers given. If you look at recommended belt tension you will realize that running the belts at spec will fold your printer in half anyways.by 691175002 - General
Quotenonfish Now that I got my printer running, does anyone know if there is a guide to updating marlin? I'd like to be up-to-date with the more recent releases, especially for some of the safety features added, but I'm not sure what settings I'll have to edit to get it to run for this printer specifically. It is pretty straightforward if you are familiar with programming. Basically just go thrby 691175002 - Prusa i3 and variants
Look at the pictures in the guide, the Y limit is mounted differently.by 691175002 - Prusa i3 and variants
Quotetadawson Marlin1.0.3-dev or 1.0.2 should compile fine *BUT* you cannot just take your Configuration.h file over, you need to edit the values into the template that comes with the new version. (Configuration_adv.h too . . .) And frankly, I have no idea what 'tripping' even means in your context, nor 'manual mode' . . . . more detail would help! - Tim The safety features shut down the printeby 691175002 - Prusa i3 and variants
Quote691175002 Mine arrived a few days ago and I've finished the assembly - still need to get the electronics set up. I've kind of been doing my own thing but the only dramatic alteration is the corner brackets. So far the kit has been pretty good, the only complaint I've got is that the Z linear bearing holders were shitty prints and I had to carve them out with a knife. Finally managed tby 691175002 - Prusa i3 and variants
Quotemsaeger How did you make the corner brackets? I am just starting but I am imagining there should be something like those in the corners. I got some sheet metal from Home Depot and used a shear/drill press. You could probably print a set of usable corner brackets but you kind of need tools to work with sheet metal.by 691175002 - Prusa i3 and variants
Mine arrived a few days ago and I've finished the assembly - still need to get the electronics set up. I've kind of been doing my own thing but the only dramatic alteration is the corner brackets. So far the kit has been pretty good, the only complaint I've got is that the Z linear bearing holders were shitty prints and I had to carve them out with a knife.by 691175002 - Prusa i3 and variants
Timing belts are already designed to have minimal stretch. Most belts come with fiberglass reinforcement and you can also choose kevlar, carbon fiber or steel as well. Note that stiffer reinforcement requires larger diameter pulleys. I find it incredibly unlikely that belt stretch is a limiting factor in print quality.by 691175002 - Developers
Hows the quality on the Folger Tech extruder? Are they pretty reliable? Would an E3D lite or similar be a major improvement?by 691175002 - Prusa i3 and variants
Quotestanger2k Do you guys have any tips with making sure that my two Y rods are properly alligned? There is a standard procedure used for aligning parallel shafts and its super easy: Basically you designate one rail as the master and align it however you want (I like parallel to the frame). Then you lock the master rail in place and leave the second rail loose. Slide the table to one end anby 691175002 - Prusa i3 and variants
Do you find that designs which blow air from only one direction produce slightly different results depending on geometry of the part being printed or the direction in which the extruder is moving?by 691175002 - Reprappers
I'm using one of these for a build I'm working on: I was intrigued because they let you completely customize the heater. You can choose the voltage, power, size, shape, thermistor and have some neat options like an insulating layer on the back. Their webpage has some more information on the options available. I contacted them with what I wanted (6"x6", 200W, 24V, adhesive backed, 5mm insulatby 691175002 - General
It doesn't really matter, but your X and Y are backwards according to standard CNC conventions: Note that the arrows in these pictures is movement of the cutting tool/extruder, so it applies in reverse to the table.by 691175002 - General
The standard misumi 8mm bearing is 5$ a pop which really isn't that bad. I'm sure their quality is top notch, everything they sell is pretty good. You may have to swap out the shafts as well though, linear bearings are very sensitive to shaft diameter and I'm not sure what the tolerances are like on imports.by 691175002 - Reprappers
What kind of arm are we talking about? Industrial equipment is very different from a few stepper motors. You are going to need more than an Arduino for IK.by 691175002 - General
The cheapest straight reference would probably be a machinists square. It is likely within a thou or two and you will probably want a good square anyways. Rulers aren't really designed to be flat in the thou range, generally that kind of thing is called a straightedge and has no markings. If UPS bends the plate it will probably be obvious. You can press it against a mirror and see if it rocksby 691175002 - General
Simplest way to check if something is flat is to put it on a surface plate and see if it rocks. You can measure the flatness of a piece by poking around with a feeler gauge, or sweeping with an indicator. Using a feeler gauge is easier but will provide less information. To perform any of these tests you need an accurate flat surface to use as a reference. I wouldn't trust glass or a counter-tby 691175002 - General
The fortus machines have zero warp regardless of build size. Here is an example of a print I did: There are examples of even larger prints with zero warp: QuoteshadowphileA liquid has a much higher heat-capacity and conductivity than air and would provide a much more gradient-free thermal environment for the part. Thermal mass isn't a big deal because we are only interested in coarse temperby 691175002 - Reprappers
Note that tooling plate flatness tolerances are across the entire sheet and are absolute worst case numbers (as in you return the sheet if it is out). A small piece is going to be better than 0.001" regardless of manufacturer.by 691175002 - General
Exactly how does immersing the print in a 70c vat of silicone oil reduce warp more than printing in a 70c heated chamber? Why would printing into a liquid reduce warping?by 691175002 - Reprappers
Depends on how rigid the design is. If you are using aluminium brackets and linear rail then 0.5mm (or even 0.1mm) will bind for sure. If you are running 8mm rod held together with zip ties and printed ABS you have more room. In a lot of cases you have the option of leaving parts loose or designing in some flex, but obviously its not ideal.by 691175002 - General
QuotethetazzbotNow, for anyone that does not have a delta, this 32 bit discussion is of no use, because really you aren't going to need that horsepower for cartesian/corexy/hbot printers. What it really boils down to is a software problem, not a hardware problem. This isn't really true. The reason why it seems to work great on 8 bit controllers is because a huge number of optimizations and shoby 691175002 - Reprappers
Quoteoak1477Also, just out of curiosity what would you consider a acceptable amount of deflection. It varies. For precision applications I would normally say <0.05mm. I suspect most 3d printers are in the 0.5-0.1mm range. Subsequent layers generally have similar toolpaths so deflection will have the same effect on each layer (effectively making it invisible unless you are getting resonanceby 691175002 - General
Linear rail bolted to tslot is really your best option. Getting the right used rail at a reasonable price can be a PITA so it might be worth just going to Hwin or another Chinese supplier and having them set you up with new parts. Even supported linear shaft is pretty accurate and disgustingly cheap as well.by 691175002 - General
Quotejohntron1. Auto-calibration or even motion using feedback from integrated measurement equipment like laser collimators. This exists for extremely precise applications but we are talking nanometers here. Quotejohntron2. Large scale motion with integrated high-precision motion system - big slides or delta arms with a print head that can position itself within its reference frame by a few milby 691175002 - Developers
QuotejohntronI didn't know this was a possibility! Which slicer(s) support these options? I don't think I've seen these in Cura. Slic3r has a blog post on the feature, they call it microlayering.by 691175002 - Developers