Show all posts by user

Where to buy a Melzi? - 10 years ago

I damaged my Melzi which worked fine for 18 months atmega644p. Think I bricked an intended replacment 1284p. should have been a straight swap in. The first 644 board had trim pots which were easy to set : turn anti cockwise till stop then 1/3rd clocwise. worked first time no problem. the 1284p board tirm pots were rubbish kept turning , so no end stop point. leads to voltage testing pita with

by mmt - Mendel90

Re: New Reprapper (Bath) - 11 years ago

Hi Steve, Congratulations getting your printer up & going. What electronics did you use?Anything in particular you look to print ? Mike MMT

by mmt - West of England RUG

Re: Setting up end stops - 11 years ago

Steve, If you are still testing and it starts move the wrong way you should be able to stop it by closing the end stop with your finger before you get belt slips on pulley, loads of vibration untill it turns itself off. Mike MMT

by mmt - Mendel90

Re: Contacts info for a get together - 11 years ago

stewartstarbuck Wrote: ------------------------------------------------------- > > If any of you have a bit of spare time I'd really > appreciate it if you could have a quick look over > it. ok Stewart have PM'd Mike MMT

by mmt - West of England RUG

Re: Contacts info for a get together - 12 years ago

ncibbit Wrote: ------------------------------------------------------- > Mike the medal 90 looks very rigid bet you are > getting some really nice definition prints on > that!? > > Nick Nick thanks, one of Nopheads original motives in the desigh was improved rigidity over the Prusa. It has .3mm nozzle so improved definition over the earlier .5. Be interested to see the EDM book

by mmt - West of England RUG

Re: Hot end stopped heating ? - 12 years ago

Thnaks. looks like the resistor as no reading copared to a spare. Fix no problem. Mike MMT

by mmt - Mendel90

Hot end stopped heating ? - 12 years ago

Possibly this shouild be in the general forum , but as it might be the Melzi board at fault... All working well one day with the M90, next day setting the heater on the extruder - no response. Didnt change anything in between. temp readng on pronterface ext = 6 degrees, bed = 6 degrees, stays at 6 degrees for hot end. confirmed by trying at 50 degrees & touching hot end bed heats up ok Meter

by mmt - Mendel90

Re: Contacts info for a get together - 12 years ago

Hello all, Since the last meetup, I finished the Mendel90 I had part built at Pauls meetup, heres a pic Mendel90 Also doing a refresher on solidworks, keeping busy on other stuff. Until yesterday M90 worked very well , hot end heater stopped working, no obvious reason, will sort it. Rob look forward to seeing the new printer when done. Neat looking clamp Hamish! Mike MMT

by mmt - West of England RUG

Re: Christmass - 12 years ago

From me best wishes for Christmas and 2013 to all in the group. Mike MMT

by mmt - West of England RUG

Re: First prints from my Mendel90 (built from Nop Head's kit) - 12 years ago

marcosscriven Wrote: ------------------------------------------------------- > Hi Mike > > As I commented to Rich, I'm so impressed by people > that build these things from scratch - did it take > you long to prepare the dibond > (cutting/drilling)? Yes,longest part of the build . Hit problems with aligning the gantry 90 degrees to the base caused by curvature in the dibond. O

by mmt - Mendel90

Re: First prints from my Mendel90 (built from Nop Head's kit) - 12 years ago

Fine look Marcos. Did mine in dibond also Mendel90 2 bits ali on base. On yours is the base dibond too? Is the white band in the hot end area part of fan duct ? Mike MMT

by mmt - Mendel90

Re: Sourcing M90 Acrylic Sheets in America? - 12 years ago

NY acrylic Q Makezine I've not used any referred to. Mike MMT

by mmt - Mendel90

Re: Sourcing M90 Acrylic Sheets in America? - 12 years ago

Menards sell acrylic. I've not used them. If you're not fixed on acrylic, wiki:- Mendel90 have been made successfully from MDF, Acrylic, Polycarbonate and DiBond. Mike MMT

by mmt - Mendel90

Re: Contacts info for a get together - 12 years ago

Stewart, Sorry but a no from me too. Would have been bit of a hike for me, so likely a no anyway, but also we're on a kitchen rebuild. project. Mike

by mmt - West of England RUG

Re: Mendal90 or Prusa? - 12 years ago

Another vote for Mendel90. I've built Prusa (not i3) and Mendel90. Used dibond instead of MDF. Good parts/service from Nophead. Heres a BOM and parts source from a US builder: BOM Ignore the 6A 12V PSU Mike MMT

by mmt - General

Re: Y idler question - 12 years ago

I have it as Gerv, except 2 bearings next to each other, per the BOM. A small bit on it here: Mendel90 axes Mike MMT

by mmt - Mendel90

Re: What SD card to get? - 12 years ago

Sounds like bit of a lottery. Anyway I ordered & already got a Sandisk micro SDHC. Not tried it yet Amazon description "Class 4 Speed performance rating (based on SD 2.0 Specification)"

by mmt - General

Re: What SD card to get? - 12 years ago

Thanks polygonhell. I figured out the form factor, its micro SD, can get 4gb for £3 Looks like theres an add on for a ramps 1.4.

by mmt - General

What SD card to get? - 12 years ago

Looking to add an SD card to my setup. Have Melzi board with ATmega644PA (SMT mounted) with a built in slot for sd card. Slot has a number 12615 on it Running Marlin also have a ramps1.4/arduino board not currently in use, but might be useful to get an sd card which could work across both setups From: "The Secure Digital format includes four card families available in three different form f

by mmt - General

Re: Where can I see a real life working Mendell - 12 years ago

wiki page Wiki page sounds local to you, could try asking. TVG Nott hack

by mmt - Reprappers

Re: Decent tap and die set (metric) under £40 in UK? - 12 years ago

Taps and dies If you do buy a cheapie, get one in a reasonable case, then you can replace with quality as you need to. I get Lyndon. Mike MMT

by mmt - General

Updated: recurring problem heaters on Melzi board not working - 12 years ago

I have Melzi Ardentissimo controller for my Mendel90. Have the mid board PWR-SEL jumper set for VREG not USB. Worked fine at first, a couple of days ago both heater controllers wont heat up, thermistors reporting typically H4 B5 and stay at that. Touched the hotend and bed to check they dont heat up. Checked for loose wires, found & fixed one. Still not working. remove & put back the PWR

by mmt - Controllers

Re: Not to beat a dead horse... - 12 years ago

Deputy659 Wrote: ------------------------------------------------------- > really figured on going with the Mendel90 but I > can't find a USA source for the printed parts. > Does anyone have such a source? Mendel90 USA? build with pics take a look at M90 build inc a BOM (Metric?) with parts suppliers worldwide. Ignore the 12v 6A PSU not needed. Mike MMT

by mmt - General

Worth paying extra for 'premium' ABS ? - 12 years ago

Switching to ABS from PLA. Have a Mendel90 / Parcan hot end/ Wades geared extruder/ UK based Looking at : ABS suppliers They do a basic & premium ABS Worth pay extra for 'premium' ABS ? Apart from price whats the difference? I'd sooner pay difference if it saves me aggro on a learning curve. Or recommend any other suppliers? Want it on a reel. Mike

by mmt - General

Re: looking for help for a first build - 12 years ago

If you're mobile, you could do worse than go to one of the meetups. A good starting pont to see what it's about. Look in 'Contacts info for a get together' on this forum.

by mmt - West of England RUG

Re: Z Axis Assembly - 12 years ago

Logrod Wrote: ------------------------------------------------------- > How did you > assess the wobble just visually or...? yes just visually. I had idea to measure with digital caliper at the top, but instead just did a quick look. Looks like I reduced the constraint, but have less wobble anyway. Maybe before pivoting on the top nut? Going to repeat for the motor end, I needed to take ap

by mmt - Mendel90

Re: Z Axis Assembly - 12 years ago

Logrod, I rough tested 2 nuts and 1 (lower) nut on the idler end. M8 brass nuts on stainless. Nophead z axis couplers / plastic sleeve on the stepper shaft. The brass nuts have some tape around to fit better in the idler. No springs. result: with 1 nut less z axis wobble. Surprised me as I expected worse, intuition said 2 = more stable. Maybe changed something else in the process, but looks t

by mmt - Mendel90

Re: Z Axis Assembly - 12 years ago

>is there meant to be an additional M8 above both X-ends and/or has anyone tried this? The BOM I had has just 2 nuts , one for each end, but I used 2 on each end in the way you say. Brass on stainless Theres some Z axis wobble but the prints are good. I havent tried with just one each so cant compare, you could just try it & see. Mike

by mmt - Mendel90

Guard loop GND wiring? - 12 years ago

What should happen with wires 15 & 16 on the 20 way ribbon cable? The wiki build manual says they are "Guard loop GND" and with a pic "Note the two guard wires linked together and insulated. " Does this mean solder them together & insulate the join? Where do the other ends go? Into any GND on the controller board? Also what they for - reduce stray inductance? Thanks. MMT

by mmt - Mendel90

One way to get M3 nuts into Y & Z clamp traps - 12 years ago

Get M3 trapped nuts in the y & z bar clamps, one way I found: Need: small bar magnet, I used 22 x 8 x5mm, had in workshop for ages. Longer magnet or use 2 end to end for the z clamps Align (to the trap) m3 nut, on end of magnet. Push into bar clamp so nut aligns wiht the hole. From other end bar clamp, if needed use small hex key or simple wire to straighten m3 nut, so holes in the right p

by mmt - Mendel90