Show all posts by user

Re: PLA on glass - 10 years ago

My 2p worth - My heated bed is not finished. Impatient to print, I tried ordinary masking tape on cold aluminium plate and finger-smeared some neat PVA glue across it. My PLA sticks great but not so fierce to be a problem. The coating has lasted fine for about a dozen prints so far.

by alan richard - Printing

Re: Pronterface scaling prints when loading files - 10 years ago

?? My... Slic3r clains the object is 30x29.98x6 It looks about 30mm in meshmixer Pronterface claims 43.3x43.29 - that includes a printed brim 6mm away from it. Do you want it to be 10mm dia? or your print comes out at 10mm? a

by alan richard - Printrun/Pronterface

Re: endstops for corexy? physical or firmware based? - 10 years ago

x min max - std reprap endstop pcbs mounted on the back of the printing head. y max on view - microswitch taken off the pcb and fitted into a screwed on plastic thing on the channel. I kept the pcb because I like to see the LED y min the same but tucked under a belt. Can't see it from here. z min just clamped to linear guide. Would be much improved with a fine tuning screw. (Next job!) -a

by alan richard - CoreXY Machines

Re: Print starts promisingly, then drifts over max pos - 10 years ago

Have a look at the other endstop post in this section - it explains disabling 'endstops only for homing' - config.adv.h etc. Printer stalls sounds like driver skipping perhaps -Its hard to diagnose which motor is at fault with corexy. Driver current? Acceleration? Slipping or skipping would cause a shift in position Arduino IDE? Not Marlin you mean? I've had no joy with the last two attempts t

by alan richard - CoreXY Machines

Re: DRV8825 Can't set 1/16 stepping - 10 years ago

Thanks for the answer. I'll try that. I see the answer is in your link. Oddly 1/8 isn't there, maybe just a typo as 1/4 is listed twice. I'm a bit disappointed with these drivers - maybe I have a faulty one. The A4988 seemed no bother. The Z is nice and quiet on 1/32 steps. A

by alan richard - RAMPS Electronics

DRV8825 Can't set 1/16 stepping - 10 years ago

Hello My Core XY was working fine on A4988 drivers until a slight mis-hap. I had to replace the drivers and replaced them with DRV8825 chips. I doubled my steps per unit from 80 to 160 to allow for the 1/32 step. X & Y while correct would occasionally miss steps. I increased current from ref volts up to about 0.6V and still it missed steps. (1.2A motors) I've read some doubts about using

by alan richard - RAMPS Electronics

Re: Aluminium Heat Bed - 10 years ago

Thanks dc42. Resistors weren't my ideal choice. I just happened to have some that add up to that number. I couldn't find an ideal 12v heater pad of my size and power requirement.The alu would be a heat spreader for a glass sheet on top. I hadn't considered the volts drop. Fotek SSR 25DD data sheet only mentions leakage current 1mA nothing about V drop. Being on Reddit doesn't make it more tru

by alan richard - Reprappers

Re: Aluminium Heat Bed - 10 years ago

Thank you to all the smart contributors to this thread. Bookmarked for ref. I hope I am not 'hijacking' but rather creating a bigger pool of information for this page. I am currently assembling a 3thk Alu plate (305x250) with 6 off 50W 5ohm power resistors in parallel to give 0.8333 ohm. About 14.4A or 172W at 12v, by my sums. fed via a 25A DC SSR Can I ask- Do I need a flyback diode across

by alan richard - Reprappers

Re: Help adding push button input to jog/ retract extruder for RAMPS - 10 years ago

Thanks for that. Interesting but a bit more complex than I need it. a

by alan richard - Firmware - experimental, borrowed, and future

Help adding push button input to jog/ retract extruder for RAMPS - 10 years ago

I'm sure some of you clever folks could do this in your sleep. . . As the title says; I would like to include 2 buttons to forward and reverse the extruder motor. This would be used for loading filament, not printing. I sort-of know the G code commands I need to send. I think I can figure out defining a pair of pins. I'm not quite sure; What pins are free for RAMPS EFB set-up to use and wh

by alan richard - Firmware - experimental, borrowed, and future

Re: Why are max endstops disabled in marlin? - 10 years ago

Another Marlin update for CoreXY . . . 3 March 2015 Fix Endstop check for CoreXY bots. The X_Axis could not home to min while Y_Max endstop was trigged. -a

by alan richard - CoreXY Machines

Re: Replacement encoder for Smart controller - 10 years ago

Thanks for the tip. I'll try to find that. Hmmm - sometimes the encoder works in the right direction ie - up and down in menu tree options is correct.When changing number values it works in the opposite direction. -Alan Thomas Sanladerer Edit2: Thanks. That did the trick - adding #define ENCODER_PULSES_PER_STEP 4 #define ENCODER_STEPS_PER_MENU_ITEM 1 as suggested to config.h Feels like a

by alan richard - Controllers

Re: Why are max endstops disabled in marlin? - 10 years ago

Thanks fellers. Cheers Bruce for yet another clear simple explanation. Hope your holiday went well! All the best a

by alan richard - CoreXY Machines

Re: Why are max endstops disabled in marlin? - 10 years ago

Thanks - I'll have a think about that. So that's 'wait to finish command' after a 'home command.' Is that for the 'stuck on a MAX endstop' issue? Ta a

by alan richard - CoreXY Machines

Re: Why are max endstops disabled in marlin? - 10 years ago

I note the following; If one axis is on its MAX endstop, the other axis can't be moved until the first axis is taken from the endstop, Although MIN and MAX both work for independent carriage moves, - I've had a situation where I've issued multiple moves from Pronterface. Maybe one of the motors skipped, not sure, but the axis has crashed into its stop and tried to screech its way beyond. A qui

by alan richard - CoreXY Machines

Re: Firmware Line Issue - 10 years ago

First error - Broken thermistor wire/ no input from hotend? Can you see a temperature display of it anywhere that shows it greater than 5°? (your min temp for extrusion) Sort that error first and see if that resolves anything Looks like an older version of Marlin anyway. May as well struggle thru with a later version if that old one's not working. Make a note of all your changes and change the

by alan richard - Firmware - mainstream and related support

Replacement encoder for Smart controller - 10 years ago

Hi The encoder switch on my RRD FGSC is a bit vague. It bounces around and jitters between values when operating it. Is there a particular spec. encoder I should replace it with? I couldn't find exact details of the one used. Would one of these drop in its place; ebay cheap Are the pin positions standard? Can anyone recommend a better quality item to use? There's this one; ebay dear Than

by alan richard - Controllers

Re: Ramps 1.4 kit, extruder won't move - 10 years ago

Dumb question - (No-one minds if they're desperate) You say; you tried heating the system Did you see the raised temperature on display? ie reported back from the thermistor. Not just by feel just a thought. . .

by alan richard - Reprappers

Re: Extruder r-e-a-l-l-l-y slow after Marlin upgrade - 10 years ago

SOLVED! (ish) Configuration.adv.h has a few lines at 237-240 // Feedrates for manual moves along X, Y, Z, E from panel #ifdef ULTIPANEL #define MANUAL_FEEDRATE {50*60, 50*60, 4*60, 60} // set the speeds for manual moves (mm/min) #endif I upped the 4*60 to 40*60 which worked after a M502 I'm not fully satisfied. I'm sure the feed before was about a mm/sec not the 4mm/sec as implied above.

by alan richard - Firmware - mainstream and related support

Re: Why are max endstops disabled in marlin? - 10 years ago

Thanks for the tips Bruce. They're useful. I'll use the 'Lower Z to max' command. Will be handy. Your openbeam machine looks very nicely constructed, I must say. I'm still w.i.p on a v slot build. I'm nearly there. Hope I can pick your brains some more when I get it closer to printing. All the best. Alan

by alan richard - CoreXY Machines

Re: Extruder r-e-a-l-l-l-y slow after Marlin upgrade - 10 years ago

Config attached. I should have said that I've not tried printing yet. The problem is when using the move axis command from the LCD controller. Thanks

by alan richard - Firmware - mainstream and related support

Re: Why are max endstops disabled in marlin? - 10 years ago

Nice work Bruce! All endstops now working! It was only the last line " #define ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLE " that I'd missed - and it works whether it is enabled or not in the LCD menu. Cheers for the help. Much appreciated. Alan

by alan richard - CoreXY Machines

Re: Extruder r-e-a-l-l-l-y slow after Marlin upgrade - 10 years ago

Thanks Wurstnase I only downloaded the firmware 2 days ago and modified the new config.h It was standard Marlin not X2 I may try another download in a few weeks. I can speed up the extruder within Pronterface but I cannot from the Graphic controller (Reprap Discount full graphic smart controller) Regards A

by alan richard - Firmware - mainstream and related support

Re: Why are max endstops disabled in marlin? - 10 years ago

Can I recycle this old thread to ask if anyone has enabled MAX endstops with a CoreXY set up. My MIN stops are all working. I've tried setting the same variables for MAXs as for MINs that I can find. Any suggestions? Thanks. A

by alan richard - CoreXY Machines

Re: Extruder r-e-a-l-l-l-y slow after Marlin upgrade - 10 years ago

Thanks. What section of G-code? A

by alan richard - Firmware - mainstream and related support

Extruder r-e-a-l-l-l-y slow after Marlin upgrade - 10 years ago

Hi. I have RAMPS 1.4 on a CoreXY (wip) I recently upgraded my Marlin firmware to 1.0.2 (latest stable) from 1.0.0 I first thought the extruder motor wasn't turning at all but it does move slowly. About 1mm per second. It does extrude the requested distance (eventually) It sounds like 'user error' to me too, but I've checked and double checked every parameter between the 2 configurations that

by alan richard - Firmware - mainstream and related support

Re: Best Z axis coupler? - 10 years ago

Couplings like this; ebay plum coupling Are a couple of quid more but are claimed to be anti backlash. The couplings you linked to can elongate slightly (like a spring) especially if a load is suspended from it. As stated - the idea of having a coupling is to allow flex for misalignment between your motor and the drive rod. If it's too rigid it will put extra side loads on motor bearings and wh

by alan richard - Mechanics

Re: Mounting Gt2 belts- Vertical or Horizontal? - 10 years ago

It won't make a difference. Mount your motors whichever way is easiest for you. You could argue that if the pulley is vertical the belt is more likely to slip to the bottom thru gravity. But so what? It won't fall off the pulley. -a

by alan richard - Mechanics

Re: source for T-Nuts - 10 years ago

What Konwiddak said- An M5 full nut will slip quite snugly down the channel of 20X20 Bosch Rexroth 6mm slot An M5 nut with a couple of flats filed/ ground will slip down V slots 5mm slot. I sound like a cheapskate but it's surprising how many nuts you end up using. BoschRexroth fittings - angle brackets etc. - come with M4 fixings but will take an M5 without modifying. -a

by alan richard - Mechanics

Re: Anyone used this type of extrusion profile fitting? - 10 years ago

Thanks Zitman. I did buy some of the cubic connectors for 20x20. They do make for a tidy corner. Those self-tappers are hard work, I chewed the heads up a little getting them in, wish I'd read your tip first. I'm not sure if they're a better corner than an angle bracket though and my first attempt at assembling them produced quite a twisted non-square construction. I think ok if clamped flat a

by alan richard - Extruded Aluminum Frames