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Re: EEZYbotARM mk2 - 4 years ago

QuoteAlfred Joosty Hello Carlo Franciscone I am a retired engineering engineer and give lectures on the subject - Free professional education through the Internet (CAD 3D -CAM) – In order to make the topic clearer, I have built a CNC milling machine, a 3D printer and also a robot (MK3) myself. Unfortunately I have a problem with the MK3 ?? I have no idea about the electronics and would

by ruyvieira - Robots!

Re: Cantilevered dual wire gantry - 4 years ago

QuoteMechaBits belt path for the other motor? This: QuoteMKSA I guess the other belt is simply: just an idler opposite the motor, the belt being attached to the gantry and move it in Y. The point is that this cantilever approach offers no benefit here, just potential trouble. What kind of trouble? Quote As for "accuracy" ? Compared to what ? To a corexy or a delta. If you build it squar

by ruyvieira - Mechanics

Cantilevered dual wire gantry - 4 years ago

The motors are represented in 1:1 size, the arm itself is a lot shorter. Inspired by this ( ), but trying to make it cartesian. May have some advantages as far as accuracy goes since you can make it with just 1 linear rail per axis (the axis that supports the arm can be made with a double width MGN15, for example), may have a bit more ringing due to belt length and the fact that the arm i

by ruyvieira - Mechanics

Re: Anisoprint flat Core XY? - 4 years ago

It's a corexy, the part of the belt path that "crosses" is just tucked in the back

by ruyvieira - CoreXY Machines

Re: (Probably) a new CoreXY-based design - 4 years ago

QuoteOhmarinus Quoteruyvieira The added weight should be a bonus for a CNC router, in my opinion. The toolhead will be gravity-assisted. Except that the weight will not be on the toolhead but strictly on the axis. Drilling down creates a point load on the axis too, only in the opposite direction

by ruyvieira - General New Machines Topics

Re: Another version of dual-wire gantry - 4 years ago

QuoteVDX ... I've "copied" this setup from a "harbour crane" around 1992 and used it for my first CO2-lasercutters Yours is the "standard" dual wire gantry path implementation, with the second wire changing planes and the gantry being attached to it. My high precision ms paint technical drawing is the same as the y-axis of this: In this version, the belt is only attached to the frame itsel

by ruyvieira - General New Machines Topics

Another version of dual-wire gantry - 4 years ago

You know how on the drawing of the dual-wire gantry people often post on the internet the gantry has one end attached to the "going" part of the belt, and the other end attached to the "coming" part? Turns out... if you use the same kind of belt path as on a h-bot, but with fixed ends, then you get a much simpler mechanism, with no need for belt twists and whatnot. Has anyone ever implemented

by ruyvieira - General New Machines Topics

Re: (Probably) a new CoreXY-based design - 4 years ago

The added weight should be a bonus for a CNC router, in my opinion. The toolhead will be gravity-assisted.

by ruyvieira - General New Machines Topics

Re: Marlin 2.0 and STM32F103C8 - 5 years ago

I tried choosing the STM32F1 environment, setting the board in the environment as genericSTM32F103CB. It shows the right specs in the beginning, like PLATFORM: ST STM32 > STM32F103CB (20k RAM. 128k Flash) HARDWARE: STM32F103CBT6 72MHz 20KB RAM (128KB Flash) But then it gives me a different series of errors Compiling .pioenvs\STM32F1\src\src\HAL\HAL_STM32F1\HAL_timers_STM32F1.cpp.o Marlin\

by ruyvieira - Firmware - Marlin

Marlin 2.0 and STM32F103C8 - 5 years ago

Was it ever possible to build Marlin 2.0 for this MCU? There are at least two boards designed for it (Morpheus and RABPS), plus the Mono Price Mini I3 controller, but I either get a "can't find included file atomic.h" or a "NameError: name 'variant' is not defined:" when trying to build it in Platformio. This happens even on a fresh install of Platformio, which makes me wonder if it was ever poss

by ruyvieira - Firmware - Marlin

Re: STM32F1/F4 3d Printer board for Marlin - 5 years ago

Just out of curiosity, what does it take to compile Marlin 2.0 for STM32F407VET6/STM32F103VET ? There are some chinese development boards out there that would work so well in a cpu/motherboard configuration. This one, for example, is nice because the seller on Taobao provided the Altium design file for it. There are some higher quality boards as well

by ruyvieira - Controllers

Re: Tab and slot cantilever-style platform? - 5 years ago

Quotedc42 Have you looked at the E3D tool changer design? It uses a cantilever bed running on a single wide linear rail. I have, it's quite the work of art, but I have no way to precisely bend a sheet like that at the moment Quotethe_digital_dentist a few comments: 1) cantilevered beds usually bounce a lot, which limits print speeds to those that don't excite resonance. End supported Z axis r

by ruyvieira - Mechanics

Tab and slot cantilever-style platform? - 5 years ago

I want to build a 20x20x30 extrusion-cube type 3D printer, with a XY stage and Z axis that goes down. I don't want dozens of leadscrews and rods because I think that's not a very good idea, but I also don't want to use a thick plate or aluminum extrusions to hold the bed, since by doing this I can easily end up with an assembly that weights more than 1 kg. So, how about a tab-and slot platform wi

by ruyvieira - Mechanics

Re: IGUS polymer bearings for carbon fiber tubes - 5 years ago

Tech2c (the guy who made the original Hypercube) uses Iglidur J bushings on matte carbon fiber tubes and it seems to work well, so do a lot other people and Igus sells carbon fiber tubes just for them. Igus bearings aren't anything special, they're just hard plastic that rubs off on rails like PTFE and it also looks a lot like PTFE in microscope images, when I thought about this my guess was tha

by ruyvieira - General

Re: GT2 vs 2GT belts/pulleys?? - 5 years ago

QuoteSupraGuy QuoteMKSA What ARE they using to make those horrid translations? I assume that it turns the instructions into a reasonably valid Chinese structure, which can then be turned back into better English than the original... Probably Baidu

by ruyvieira - General

Re: Conductive Paint - 5 years ago

Didn't receive them yet Some people say they don't work at all for large beds, which is not my case

by ruyvieira - General

Re: ESP32 Printer Board - 5 years ago

ESP32 has so much going on I'm not sure it would be good to run the 3D Printer firmware on itself, now, since it has a serial interface it could easily work as a master for a slave accepting only G-Code input. I didn't read the entire thread, this has probably been mentioned.

by ruyvieira - Developers

Re: Conductive Paint - 5 years ago

QuoteMKSA Quoteo_lampe Quoteruyvieira You know that's actually a good idea? You can make one with two bits of copper clad and a sheet of conductive foam, both of which I just happen to have lying around You could wire it in a wheatstone bridge-fashion to amplify the difference. Or use one on each side of the plate and use an OP-AMP to amplify the difference. Not could, MUST ! If you don't see

by ruyvieira - General

Re: How to improve print quality at higher speeds? - 5 years ago

Ways to heat the hotend more: use a 12v heater instead of 24v. I used to do this, the nozzle heated really quickly, then I changed it for a 24v cartridge and well it slowed things down a lot to say the least How to increase the extruder force: I guess with a 1:2 reduction? I have a 1:3 Titan clone and it skips steps when the extruder feedrate is above 15mm/s. For that feedrate I need about 300 s

by ruyvieira - General

Re: Conductive Paint - 5 years ago

You know that's actually a good idea? You can make one with two bits of copper clad and a sheet of conductive foam, both of which I just happen to have lying around

by ruyvieira - General

Re: Conductive Paint - 5 years ago

QuoteMKSA Conductive paint on the bed ? Indeed ! But ? Force sensitive resistor ? Why not but what about strain gauge or piezo or ... ? Yet, let's make it simpler and have just one sensor integrated in the printhead Plastic blob on the nozzle ? No big deal, home when all is at working T°, eventually wipe before homing and make your sensor trigger around 1N. Working like that for about 2 years.

by ruyvieira - General

Re: Why not to use spring tensioners on timing belts? - 5 years ago

This one should make it a bit easier to see the extra ringing that the spring may or may not add (I won't tell which one of the two was printed without, you have to use your calibrated eye to tell)

by ruyvieira - Mechanics

Re: Why not to use spring tensioners on timing belts? - 5 years ago

I decided to add a spring tensioner to my printer's belt just to see if it's as horrible as people say. Long story short: it's not. I doubt anyone can guess which one of those two small enclosures for a 40x40mm board was made with a belt spring and which one was made without. I'll post more pictures if just this one isn't enough for a blind test (heh). Hint: they're both silky smooth in real l

by ruyvieira - Mechanics

Re: Conductive Paint - 5 years ago

Conductive paint would work to make a force-sensitive resistor, or a few of them all over the print area. You'd use a MCU (like an attiny85) to measure the resistance and generate a low signal when it changed.

by ruyvieira - General

Re: Conductive Paint - 5 years ago

Lulzbot Mini, Taz 6, Zortrax does something similar, but instead of conductive paint they use conductive things on certain spots. It tends to fail over time because plastic on the nozzle isn't very conductive, if you know what I mean. This scheme works for CNC routers because usually the bit is pretty clean. Conductive paint is a bit expensive (36$ per kg + shipping), if you need to keep reapply

by ruyvieira - General

How to improve print quality at higher speeds? - 5 years ago

I'm used to printing at 70mm/s tops, but at 150mm/s and beyond I get bad corners and either bad overhang curling (at temp high enough for flow to be good) or underextrusion (if I lower the temperature to decrease the curling). What could I do to improve this? I'm using a regular MK8 extruder and two 5015 blowers. Would a geared extruder, 32 bit board and a better fan duct help me here?

by ruyvieira - General

Re: re anyone used Trianglelab nozzles? - 5 years ago

I use their E3D-sized blocks. I haven't tried anything better than the usual aliexpress nozzles because they've been good enough so far

by ruyvieira - Mechanics

Re: Belt z axis - which gears? - 5 years ago

I'd do 3 but use something like a solenoid with a rubber on the tip to brake the transmission rod to keep the gantry from falling down in case of power loss. I don't think it makes that much of a difference to have that much resolution on the z axis. Even SLA printers like the Forms2 only have just a 1 or 2mm pitch trapezoidal leadscrew so you're not gaining anything by having a huge reduction li

by ruyvieira - Extruded Aluminum Frames

Re: using non-idler pulleys as idlers directly on the shaft - no bearings - 5 years ago

QuoteEd3D 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? People think it will give you extra-ripply vertical surfaces and flatten your belt and or shred it, but in practice it's fine, lots of commercial printers do that (Lulzbot Taz, Makergear M2 and most of the Creality 3d printers)

by ruyvieira - Mechanics

Re: using non-idler pulleys as idlers directly on the shaft - no bearings - 5 years ago

That'll save you about 1% of the total cost and work very badly. It's the typial money saving scheme that costs you more over time. Idlers cost like 60 cents. A pair of F695 will cost between 57 and 80 cents and in my opinion performs better

by ruyvieira - Mechanics