Hello All I wonder if anyone can point me towards a source where I can get the Mendel X-Carriage (upper part) dimensions? I wish to modify Erik's push fit bowden coupling to fit on my Mendel with some minor modifications. Unfortunately one cannot modify an STL using HeeksCAD which is currently my tool of choice. Thanksby AgeingHippy - General
Nice one Glad it workedby AgeingHippy - Skeinforge
Michael Sorry I cannot help with your materials calculations, but I would like to point out that it is very rare that we print anything with a solid inside. I have not printed much, but excluding the shels of my objects (usually about 3 layers) the infill is around 20% or 30% (or 80% to 70% hollow). So you would need to decide how solid you wish your objects to be. Regardsby AgeingHippy - General
Seems very relevant to our world here at planet RepRap sorry if this is old hat or already been linked elsewhere.by AgeingHippy - General
A £300 printer will certainly be a bargin. I did some summing up a couple of days ago and my total spend stands at over £900 !!!by AgeingHippy - For Sale
oops Enshuldegung bitte. My age is causing me to transpose numbers. G21 tells it to go metric (Just as well I did post preview. I put G12 again lol)by AgeingHippy - Skeinforge
I purchased 1.5m of 1/8x14 (or 3.2mm ID by 6.xx mm OD) @ £6.?? per meter. They had a 1.5m offcut so I did not have to pay the £10 small order surcharge (for orders under £50). Delivery is £6 and with 20% VAT on top of all that I will end up paying £19.?? for 1.5m tube. Damned expensive in the end!! Their metric 3mm ID by 4mm OD is just under £2 per meter and their 3mm ID by 5 (or is it 6)mm ODby AgeingHippy - General
It's been a while since I installed skeinforge, but are you not supposed to place the skeinforge folder in the root? or was that just for Windows so that the path does not contain a space?by AgeingHippy - General
Hi All I am looking at putting a Bowden extruder on my printer. I have sourced 1/8x1/4 PTFE tube (id = 3.2mm) and was wondering if given my PLA is 2.9mm whether I should rather go for 3mm ID tube. Really, is the stretching/compression of the PLA (and hopefully later ABS) noticeable over 0.5m perhaps? Or would it be negligable compared to the stretching of the bowden cable itself? Cheers for aby AgeingHippy - General
yes Bob, but I assume you are zeroing the Z-axis at the dump point rather than at the origin because you are concerned about a possible head crash? The issue is not with the Z axis. I will repeat what I suggested... Perhaps you should (also) at the very least place your current line 19 and 18 BEFORE you set the Extruder position to 0. so ... G12 ;set to metric - this replaces line 19 G90 ;Setby AgeingHippy - Skeinforge
I know Let me know if trying what I suggested helps or not.by AgeingHippy - Skeinforge
no worries dude Pleasure to helpby AgeingHippy - Skeinforge
Hi Bob Seems like a lot is going on here in your code. I have commented a section and inserted line numbers for ease of reference 1 - M104 S210 ;set temp 2 - M116 ; wait to reach temp 3 - G92 E0 ; set Extruder to 0 4 - G1 F50 ; set feedrate 50mm/min 5 - G1 Z8.0 F50 ;move Z axis to 8mm 6 - G28 Y0 ; Home Y axis 7 - G92 Y0 ; set Y axis co-ords to 0 (redundant aby AgeingHippy - Skeinforge
Hi eustace I may be mistaken, but I don't really see anything the extruder controller is doing as timing specific. The extruder motor step and direction signals are coming from the motherboard via the SDA & SDL lines so I think the extruder controller is really only being used to monitor and turn heaters on and off (extruder and heated bed) and the fan. Of course the motor driver sits on tby AgeingHippy - General Mendel Topics
Hi All I have solved the problem. I had my Extra Shells set to 2 on the FILL tab. Setting them to 0 gives me infill. Setting it to 1 still does just the outline. I got here by calculating the thickness of the various lines as calculated by Skeinforge and saw it was deciding it could not fit the extra shells so was doing nothing. My layer width is 0.35 Perimeter width over layer thickness ratby AgeingHippy - Skeinforge
Hello All I am using Skeinforge to slice an object with 2mm thick sections, but is is only giving it walls... no infill?? Anyone have any ideas? Cheersby AgeingHippy - Skeinforge
Hey Anthong That looks like an interesting calibration piece. Do you have an STL?by AgeingHippy - General
stupid question, but is it in your generated gcode? Maybe you are priming your extruder after sending the G92 E0 instruction and then not resetting it to 0? But then you say it only happens when you have extruded using some form of host before actually printing....?? weird. Perhaps you can post the initial section of your gcode here for fresh eyes to peruse?by AgeingHippy - Skeinforge
Cheers I did not read your post with full attention. I am planning on getting one of those small fans tomorrow so will try cooling down the thermal break and see what happens.by AgeingHippy - General Mendel Topics
Hello All I currently use HeeksCAD for my 3D modeling, and have found that although I can open an STL file I cannot use the union etc functions to modify it. Can anyone assist? Cheersby AgeingHippy - 3D Design tools
Hey Adrian What are your feed and flow rates set on the speed tab? Mine are both at 30. Then look at your perimiter feed rate over operating feed rate (ratio) and similarly the ratio for your perimiter flow rate. also on the speed tab. I would guess your feed and flow rates are fairly high and your ratios are less than 1. If this is the case then try lowering your feed & flow rates.... Thby AgeingHippy - Skeinforge
@JnsMuovi What is happening is when you instruct the printer to extrude it sets the E value to some value. The more you extrude the higher the E value will be. Then when you print your gcode probably gives the printer a low E value command, expecting the current E value to be 0. The net result is that the extruder must reverse to get to the instructed point... Simply edit your start.gcode fileby AgeingHippy - Skeinforge
Hmm... that is interesting information brnrd. I will try lowering my temperature and see what happens.by AgeingHippy - General Mendel Topics
Why not make a bowden extruder? That way you remove the entire extruder structure from the printer... gaining much more extra height than you would using a direct drive extruder.by AgeingHippy - General
I get a blob every time a thread starts. I am very interested in finding a solution as well. Could it be due to the fact there is no accelleration? The head does not move at the specified speed immediately, or perhaps some form of backlash... although I doubt backlash because it is at the start of every thread.by AgeingHippy - General Mendel Topics
Anthong Redbeard Wrote: ------------------------------------------------------- The Hybrid one was similar to the PEEK but without friction issues... but i kept some of the PTFE issues, if screwed in too tightly the ptfe could warp, too loose and the gap would cause a jam. I had an issue with that, but what I now do is when I screw the barrel into the PEEK and it buts up against the PTFE I seeby AgeingHippy - General
lol - Anthong you seem to indicate you feel you have been bashed by a heavy club To clarify though - have you had the barrel pushed out of the PEEK/PTFE section or the entire hotend+thermal break being pushed out of the extruder mount? I have a strip of metal which backs up against the PEEK and holds the hotend+thermal break assembly to the extruder block in much the same way the external suppby AgeingHippy - General
I don't think this is a valid test since the print quality is so dependant on the configuration of gcode generation (eg skeinforge) and the configuration of the machine. The disparity between the ability and dedication of various builders will be so great that it would be like comparing a drawing by different people and saying it is a valid test comparing the artistic skills of different nationsby AgeingHippy - General
Hey 3D head FWIW I am handy with my hands and professionally a programmer. I have (read had) absolutely no knowledge of electronics. I elected to source and build my own Mendel. It has been a voyage, and in fact still is... I am printing but the quality is not there yet. I could ramble on about my trials and tribulations but suffice to say the amount of money I invested in parts kept me goingby AgeingHippy - General
FWIW I have the PTFE/PEEK hybrid developed (to my knowledge) by Brian Reifsnyder. It contains a PTFE thermal break constrained in PEEK. The barrel of the hot end is screwed into the PEEK and butts up against the PTFE. This configuration was developed (apparantly) due to the fact that PTFE thermal breaks that the barrel screwed into was giving under pressure & heat. I had to bore out a new Pby AgeingHippy - General