@smartfriendz Please keep the options in openjscad! I would like to change wood and still be able to make new prints of version 1.2. Can you leave in openjscad as it is and only focus on the simplified options for the next version (1.3?)? Thanks, Simonby smerrett79 - Smart_Rap
@Mandrav, thank you. Not sure I'll get those files to work for my setup (E3D Lite6) but I'm going to try something else first. Your prints look amazing! Please could you give us more detail on the bushings/rods you use?by smerrett79 - Smart_Rap
Yiannis, please could you share your print cooling fan setup? thanksby smerrett79 - Smart_Rap
Look at this section of configuration.h for the print volume dimensions: //Travel limits after homing (units are in mm) #define X_MIN_POS 0 #define Y_MIN_POS 0 #define Z_MIN_POS 0 #define X_MAX_POS 200 #define Y_MAX_POS 200 #define Z_MAX_POS 180 Then look at this section for safe z homing (enable this) which puts the print head in the centre of the print area before z homing: //If you haveby smerrett79 - Smart_Rap
I use Marlin. Very happy with it but I haven't tried anything else. I am reasonably happy with arduino code, which might make it seem easier to use to me, but I wouldn't say you need any arduino experience to use marlin. There's a good selection of guides on the Web.by smerrett79 - Smart_Rap
I'm using M8 threaded rod (single) for my reprap Mk3 heated bed works fine but I can't fully rule out a z axis ribbing from being caused by this design (but more likely my implementation of it). I think you might need to look for a custom heated bed. Thomas Sanladerer does a good video on YouTube about heated beds. You might want to think about your power supply and controls (24V, which board, reby smerrett79 - Smart_Rap
Definitely think that the acrylic sides will be important - racking failure mode is something I can see adding artefacts to the prints at speed.by smerrett79 - Smart_Rap
Sorry for the lack of updates, this is a photo mid print. After struggling with adhesion to the aluminium Mk3 heated bed (working with 60*C and glue stick for the time being) I think I am getting some nice prints going. I routed the endstop switch and stepper cables through to the rear of the box, where I have mounted the RAMPS, extruder, ATX PSU and filament spool holder. I cut out some squareby smerrett79 - Smart_Rap
The IRLB8743PBF mosfets are in. Happy to post at cost to anyone who wants something that is going to heat up their RAMPS 1.4 less. PM me.by smerrett79 - Smart_Rap
Might not make such a difference after allby smerrett79 - Smart_Rap
I think 3 in 1 is very different to wd40, which is much lower viscosity. Are you sure that's equivalent to 3 in 1? Wd40 company actually produces 3 in 1 so that makes me think there's more difference than just viscosity. I stand ready to be corrected by someone who knows what they're talking about though!by smerrett79 - Smart_Rap
The YouTube channel gives a clear (to me) guide on installation of the xy belts.by smerrett79 - Smart_Rap
"maximum" is dependent on your appetite to accept or ability to mitigate the deflection in the rods across the build area. Different sizes, materials and cross sectional profiles of beam (rod) will have varying resultant deflection. The other factor is the time length of prints you want and how much extra volume the larger prints will be. Extruders don't scale up as easily as linear motion partsby smerrett79 - Smart_Rap
@John Cummings, the size of mine was based on needing 2 rails for the Y axis and 1 for the x axis. V slot profile is sold in a 2m length and my supplier in UK was prepared to cut it into 3 pieces for me. Not only did I get better edges but also think there was less chance of getting the pieces bent in transit (imagine 2m in the mail system!).by smerrett79 - Smart_Rap
I am slowly designing a larger printer, about 450mm cubed build volume. You should consider the stiffness of the rods as you increase length - it's not a linear relationship between beam (rod) length and vertical deflection (sag) under the weight of the machine parts it carries. I calculated that I would need very heavy rods to make the x axis stiff enough to avoid a significant difference in heiby smerrett79 - Smart_Rap
@sethmo, I like your idea about possibly putting the electronics in a false floor. I settled on hiding it round the back and cut slots with 3x 6mm drilled holes next to each other to push plugs through to the rear. I think the cooling requirements would make me nervous of putting the stepper drivers and mosfets in too enclosed a space until I have forced ventilation.by smerrett79 - Smart_Rap
OK, post mortem, post match analysis, after action review: I got the XY stepper motor plugs wired the wrong way around! I can't believe (although now have to) that this made such a difference. The massive Z compensation values were related to the bed lowering by 8mm at each point probed when I had that mysterious issue that resolved itself just as mysteriously. For note, the Z & E motors' wirby smerrett79 - Smart_Rap
Guys, I've built it but having massive issues with the Marlin and repetier host when trying to set directions. I noticed that the #define INVERT_X_DIR true #define INVERT_Y_DIR true make my printer run in the opposite directions. I could change this by setting endstops to MAX but this seems really strange. If I set the invert XY directions false, I get repetier host treating manual controls aby smerrett79 - Smart_Rap
Yes, it's the vibration nose transmitted through the house that I'm concerned about. I do lots of my printing after my wife and children have gone to bed and a couple of them are very light sleepers. What is your VREF set to now and what did you have it on when you were getting drift? Also could you just confirm you're using A4988s with nema 17 motors? The IRLB8743PBF is a MOSFET. They are thby smerrett79 - Smart_Rap
Sweet! What speed are you running prints at and how's the noise? Are you in UK (you used £ costs)? I'll be getting some IRLB8743PBF to upgrade the RAMPS soon from a bigger Farnell order and am happy to get some for others and post at cost. They are 65p each on Farnell and £2 on eBay but I know I'm getting genuine parts from Farnell - ebay is a counterfeit lottery as far as I'm concerned. Let meby smerrett79 - Smart_Rap
Awesome, I love seeing these things coming together.by smerrett79 - Smart_Rap
Thanks, I've got a 33k and 45k ready to get 5V from 12V signal.by smerrett79 - Smart_Rap
Dollar store foam sheet doesn't look like it would absorb much sound. I have just become the proud owner of some carpet offcuts and was thinking of mounting rectangles of it, pile towards the MDF, on the outside of the printer. For the inside, I'm thinking of packing foam (about 3mm thick and comes in a roll - not bubble wrap). This might also help maintain a stable temperature inside the eventby smerrett79 - Smart_Rap
Thanks - I'll assume it's the divider.by smerrett79 - Smart_Rap
I knew I'd seen discussion about these mosfets before. Seems like they won a shootout a few years ago here: Seems like a sensible move and they're on my shopping list now.by smerrett79 - Smart_Rap
I don't know if Lowes has a cutting service but B&Q in UK does it free if you're buying a sheet from them. It's mm perfect and super square. Definitely worth getting them to do it IMHO, unless you're the typical American I have concocted in my head from watching too much YouTube - you have all got massive workshops full of professional machines, proper lighting, heating and ventilation, whereby smerrett79 - Smart_Rap
Quotewillera Finished yoda, one ears abit funny bit otherwise good! happy That's an awesome first print! Which version of voltage regulator or voltage divider for the inductive sensor signal did you use?by smerrett79 - Smart_Rap
I'm not a stepper motor expert but I believe that it's only excessive loads which cause missed steps. What "excessive" is set at depends on the available current and voltage to drive the motor, so a low VREF will find smaller mechanical loads excessive than a large VREF setting. As I reported in my build thread, x and y axes didn't miss steps in a manual move when I dropped VREF = 0.25V (my A49by smerrett79 - Smart_Rap