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Re: Z probe questions - 5 years ago

Two things: when probe fails it may destroy your effector and/or nozzle, second is the cost.

by newbob - General

Re: Belts - Whats the best you can buy? - 5 years ago

Just a followup to what I posted earlier... After putting 32t pulleys and 10mm PU-steel belt to use I would only recommend it if you have a very sturdy frame and mounts. PU-steel belts are rather stiff and need much more force to tension them adequately (compared to rubber belts). I don't have a problem since in my printer idle pulley and stepper are attached to the same profile but I can see

by newbob - General

Re: Best 3d printer to make from scratch - 5 years ago

There are a lot of bad designs and price is not an indication of item's quality, precision or speed. I started 3d printing recently and I figure it's probably four things that matter - backlash (belt or screw drive, material and frame stiffness), positional accuracy (stepper torque and gearing), inertia (heavy parts require higher stiffness at higher speeds for same accuracy) and extruder's perf

by newbob - General

Re: Control board questions - 5 years ago

Duet is a nice board, probably the best if you have a delta printer. I'm hoping that when smoothieboard v2.0 comes out, duet will get cheaper

by newbob - General

Re: Best 3d printer to make from scratch - 5 years ago

QuoteTrexation I have been doing some research lately and have come across the cheapest way to get a T-slot aluminum frame without compromising quality, just costing time. The Extrusions: The extrusions themselves can be purchased from 80/20 through eBay in lots, these lots are parts that they cannot sell for one reason or another and so they sell them in lots by auction. It can easily be 50% ch

by newbob - General

Re: Best 3d printer to make from scratch - 5 years ago

Quotesudarshan Thanks for the input jinx... I have already gone through the hypercube documentation....it can be a great option if we can improve the frame by adding gussets.....refer to the article on aluminum extrusions on hackaday....however it would be even better if we can use least amount of 3d printed parts in it....Plus I plan to use profile linear guides...any suggestions on that? As f

by newbob - General

Re: Smoke detector using endstop circuit. - 5 years ago

QuoteDjDemonD Tried and tested I'd agree with others who have commented before no fire safety system should be running off the microcontroller which could be in a fault state when you need it to work. I like, in this setup, that when the smoke alarm clears (40 sec after smoke clears) power remains off. If I read the schematic correctly - circuit will continue sending power to the printer wh

by newbob - General

Re: Delta Printer Portability - 5 years ago

I would view ability to locate motors outside of the enclosure as a plus. Here's corexy design, that could be easily translated from acrylic to aluminum (make X axis vertical for smaller footprint: Footprint of above is about: Build width +140mm +40mm(effector) X Build length + 120mm + 40mm (effector) so in case of 150mmx150mm print area: 330mmx310mm Delta with 210mm printing circle would h

by newbob - Delta Machines

Re: Smoke detector using endstop circuit. - 5 years ago

QuoteDancer Quotenewbob Here's an idea: have smoke detector relay connected to GFCI outlet that 3D printer is connected to. When smoke is detected, relay shunts hot to ground (through current limiting resistors) triggering GFCI protection. Simple and independent of 3D circuitry that could be on fire and unable to process relay input in software. Thats not nice to do a power short, just to do

by newbob - General

Re: Delta Printer Portability - 5 years ago

I think corexy with vertical X axis would actually be as fast and and small when compared to delta (150mm cube build volume is about 212mm inscribed circle with delta design). Small corexy would not need anything larger than 2020 profile and would be extra fast and rigid with minature,15mm linear guides for Y and Z axis (I would go with carbon fiber rods for X like in original HyperCube). Of

by newbob - Delta Machines

Re: Smoke detector using endstop circuit. - 5 years ago

Here's an idea: have smoke detector relay connected to GFCI outlet that 3D printer is connected to. When smoke is detected, relay shunts hot to ground (through current limiting resistors) triggering GFCI protection. Simple and independent of 3D circuitry that could be on fire and unable to process relay input in software.

by newbob - General

Re: Precision Piezo Z-probe Now available. - 5 years ago

QuoteMoriquendi A strain gauge is what you would need for that kind of continuous measurement but they come with their own problems. Strain gauges are highly temperature sensitive and normally have to be used in pairs where only one is exposed to the force and the other, mounted nearby, is used to compensate for temperature changes. Software integration is a whole 'nother problem. Idris Hi. I

by newbob - General

Is PETG plastic less toxic than PLA? - 5 years ago

I've been printing with PLA because it's 'plant based' and 'compostable'. However I read research that found PLA released the most of chemicals with EA (estrogenic activity) of all plastics tested! On the other hand, another study found that PETG did not release any EA chemicals: "Ten unstressed or stressed glycol-modified polyethylene terephthalate (PETG), cyclic olefin polymer (COP) or copo

by newbob - General

Re: new flsun amazing delta - 5 years ago

QuoteAlexander Amelkin To me, the flsun model looks a lot more solid than that of SoMars. The SoMars model is basically the same wobbling design as Rostock G2 or 301. The flsun's frame doesn't look like it can be slanted, bent or twisted. I would love to see a diamond-headed (3-in-1-out or even better 5-in-1-out) version like that from flsun. How can you tell how sturdy it is? I do not see any

by newbob - Delta Machines

Re: Nichrome wire temperature sensing - 5 years ago

Quoteleadinglights Quotenewbob 'heater wire' hot end is on my try-it list. I consider resistance temperature sensing a non issue - if it does not work - I'll be fine with a thermistor. Big hurtles are mechanical fixing of the heating wire to the nozzle and thermal conductivity and capacity of it. I plan on using 32 or 36Ga Kanthal (temco ire in UK?) wire attached longitudinally (S pattern) whi

by newbob - General

Re: Belts - Whats the best you can buy? - 5 years ago

Quoteshortyski13 Quotenewbob To me the most important specifications when choosing the belt were backlash and repeatability. I picked GT2, 2mm pitch for lowest backlash and 10mm width for repeatability. As per sdp-si.com, GT2 2mm belts have lowest backlash (equal to or slightly better than trapezoidal belts), that is much lower than GT3 3mm or HTD belts. GT3 3mm and HTD belts are more suitabl

by newbob - General

Re: Removing vertical lines on prints - 5 years ago

Do you know if LV8727 would be close to LV8729 performance?

by newbob - Delta Machines

Re: A website tool estimates print time accurately based on speed/acceleration/jerk - 5 years ago

After more testing I noticed that the App does not give results when Jerk value for E axis (I have not tested others) equals 0.

by newbob - General

Re: A website tool estimates print time accurately based on speed/acceleration/jerk - 5 years ago

Success - this time I got a result: G-Code Statistics Number of Lines 1294732 Print Time 04:09:47 Time Spent Accelerating/Decelerating 00:17:45 (7.1%) Time Spent at Target Speed 03:52:01 (92.9%) Total Move Commands (G0 & G1) 1292378 Move Commands Reached Target Speed 1241814 (96.1%) Print Move / Travel Move 1216995 (94.2%) / 75383 (5.8%) Total Distance Moved 797.84 m Print /

by newbob - General

Re: A website tool estimates print time accurately based on speed/acceleration/jerk - 5 years ago

I tried IE and it just keeps the button beveled for a while than nothing happens, chrome just says the page has crashed and should be reloaded. As to my retraction question - jerk and speed for E axis would yield different total speed result depending on retraction length as, example, retraction of 4mm vs 1mm for every nozzle travel longer than x.

by newbob - General

Re: A website tool estimates print time accurately based on speed/acceleration/jerk - 5 years ago

Thank you for doing this - this will help me choose, as you said, most optimal value for jerk and acceleration. The website worked for me with a small file but 40MB file failed probably because it takes too long to upload. PS.: have you considered implementing retraction option? I would think that retraction would have quite large effect on total print speed.

by newbob - General

Re: Belts - Whats the best you can buy? - 5 years ago

Quote691175002 I've been using genuine belts (Misumi/McMaster/SDP-SI/Gates) just because they are pretty cheap and these suppliers keep a wide inventory of belt lengths. I have noticed that open lengths of belt are quite unusual in industry and are sometimes quite expensive - You can only buy genuine 3mm/15mm Gates in 100ft rolls and they list for >$400USD. Steel core belts aren't really ide

by newbob - General

Re: Nichrome wire temperature sensing - 5 years ago

'heater wire' hot end is on my try-it list. I consider resistance temperature sensing a non issue - if it does not work - I'll be fine with a thermistor. Big hurtles are mechanical fixing of the heating wire to the nozzle and thermal conductivity and capacity of it. I plan on using 32 or 36Ga Kanthal (temco ire in UK?) wire attached longitudinally (S pattern) while using a combination of high

by newbob - General

Re: Belts - Whats the best you can buy? - 5 years ago

To me the most important specifications when choosing the belt were backlash and repeatability. I picked GT2, 2mm pitch for lowest backlash and 10mm width for repeatability. As per sdp-si.com, GT2 2mm belts have lowest backlash (equal to or slightly better than trapezoidal belts), that is much lower than GT3 3mm or HTD belts. GT3 3mm and HTD belts are more suitable for CNC machines than 3D pr

by newbob - General

Re: Nichrome wire temperature sensing - 5 years ago

Pistons (and other engine components) are sometimes coated with ceramic which is non conductive and high temperature resistant. Might be an inexpensive process if, based on google searches, even bicycle parts are being coated.

by newbob - General

Re: Deal on hardware for RepRap - 5 years ago

Astroturfing is so prevalent that it's hard to spot a genuine post so I compared ebay, aliexpress and Trimcraft Aviation RC prices. Here's what I looked for: 50 M5 ss nylon-lock nut: aliexpress: $2.36 shipped. 12-20 days delivery time TA RC: $3.95 shipped. I would think delivery would be under 7 days ebay: $6.65 shipped. The site is fast, easy to navigate, and gives shipping q

by newbob - General

Re: new flsun amazing delta - 5 years ago

Linear guides are such a good fit for small and medium size deltas it's really hard to recommend any Delta that is not using them. If you like Delta printer with linear rails here is one that is all metal (but smaller) where flsun appears to have acrylic base ( and maybe other parts):

by newbob - Delta Machines

Re: Enclosure Air Filtration system - 5 years ago

Hi Simspeed Just to clarify (not to convince) how I imagined it would go together: Hookup and conduits would be the same as per your drawing only larger. Of course it could be mounted at the bottom or the top. What software are you using, btw?

by newbob - General

Re: Enclosure Air Filtration system - 5 years ago

Quotesimspeed Good points fellas....thanks for pitching new ideas. I think this redesign is likely what I will go with. I'm using a larger 140mm fan and up-sizing the pipe to 4" ABS. This allows me to build reducer adapters that hold two 1/2" x 5.5" activated charcoal coffee filters above and below the fan as shown. I want to keep the quick change clamps to change these filters when needed.

by newbob - General

Re: Belts - Whats the best you can buy? - 5 years ago

I've decided to go with 2.4A 0.9deg steppers, 9mm PU/Steel belt and 32T pulleys (for a delta I'm putting together so I don't have much experience). I do think 9mm wide belt maybe a little overkill as PU 6mm steel reinforced belt I have seems very strong but for $15 extra (for larger belt and pulleys together) I just went with the 'bigger is better'.

by newbob - General