Extremely useful piece of information, A2! Thank you! Actually, I never saw so good explanation for the problems of the screws.. Best regards! Bobbyby BoByS - Mechanics
For up to 1000 mm strokes you better use linear bearings/cylindrical smooth rods (like these in 3D Printers). For 1000+ mm - you will need more support on the movement so you better go for ball carriages/guide rails and slotted linear bearings/supported rods. For faster movement you will need belt driven system on the X and on the Y axis (if you're not designing a CNC router table). If you're deby BoByS - Mechanics
Quotewaitaki There is no design flaw. Normally, the large gear has several washers located between it and the extruder front bearing. This gives plenty of room for the motor screws to be located. I have attached a pic to show what I mean (usually only 2 to 4 washers). Looking at your pic, it seems to me you are using cap head screws - round head ones should be used and these should sink into theby BoByS - Mechanics
I'm so sorry, but I can't give you an answer for your question... Thanks for the quick respond... I bought them Online as a kit (only for the plastic parts) so I don't have a reference point. Everything else fits nice (not perfect but nice) and I have some troubles only with the extruder... I don't have the 3D models (I will try to import them from the STL files - today I was able to do this) toby BoByS - Mechanics
Dear friends! I'm building my first 3D printer (version of the popular Prusa i3). But I discovered a design mistake with it's extruder ("Greg's Wade v4" or "Jonas's extruder"). Am I the only one who have this problem (see the picture below)? Actually, I was searching on the Internet about this and discovered that some people put only 2 screws in the extruder's body, but in my case, there is onlyby BoByS - Mechanics
Theoretically, if your rods are not hardened, the balls in the bearing will scratch the surface very quickly. So, be sure that they are stainless steel, hardened and with h6 tolerance. I asked some companies (I wanted to make them by myself, too), but they told me prices like 40-45$ for a linear meter which was too high for my project. I bought them ready made on the Internet. Best regards, Bobbby BoByS - Mechanics
Wow, thank you very much for all of the interesting stuff in your answer. It's really clear now! Best regards, Bobbyby BoByS - Controllers
Dear friends! It's Bobby here. I'm living in Bulgaria and I'm a mechanical engineer (bach and master degrees in Automation and Robotics) and now I'm studying PhD degree in Machine Elements. I'm building my first printer now. I was looking for a good platform for me for about 6 months (yeah, I know it's a loooot time) and chose the Prusa i3 3D printer. I modified it a little bit and start buildingby BoByS - Controllers