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Filament comparison charts with prices: https://www.filaments.directory/
PLA Filament reviews
- PLA Filament Guide 2018: https://all3dp.com/1/pla-filament-3d-printing/?utm_source=push
- Nice review of many filaments PLA: http://3dprintingindustry.com/2015/01/21/pla-best-3d-printing-ask-3d-matter/
place, url, type, cost, did it work? (place in order of descending price)
- Makerbot, http://store.makerbot.com/filament, PLA $48/kg, good filament but overpriced
- Ultimachine, https://ultimachine.com/, pla/abs, $44/kg, good high quality filament no strings, shiny
- Lulzbot, https://www.lulzbot.com/catalog/pla, PLA $43/kg, good quality no problems (also ninjaflex $60/0.75kg is awesome)
- Matterhackers, http://www.matterhackers.com/3d-printer-filament-compare, PLA $31/kg, good filament -- for smaller rolls can't print with the material at end of roll
- Zeni Kinetic, http://zenikinetic.com/filament/, pla $30/kg, duller colors some strings but good for most applications
- Push Plastic, http://pushplastic.com/, $29/kg w/free shipping, many colors and plastics to choose from. Colors are very vibrant. Prints very well. Made in the USA.
- MakeShaper, http://shop.imade3d.com/filament.html (http://www.makeshaper.com/product-category/pla/1-75mm/), PLA, $17/650g ($26/kg) from Imade3D or $21/kg from MakeShaper, good quality and prints well
- 3D Solutech Through Amazon, http://www.amazon.com/gp/product/B00MB32T4O/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1.html, PLA, $26 -Good Filimanet however slight stringy difficulties due to being translucent filament.
- Hatchbox, http://www.amazon.com/HATCHBOX-1-75mm-3D-Printer-Filament/dp/B00J0GPC80/ref=sr_1_1?ie=UTF8&qid=1414676593&sr=8-1&keywords=blue+pla, $23.00/kg + amazon prime shipping, This filiment prints excellently, is completely opaque and is spooled very well. Highly Recommend
- Foxsmart, http://www.foxsmart.club/3d/filament.html, pla, $20/kg, I used white filament and it is printing well. The cartridge is a little bigger and does not fit standard spool holder.
- Jet, PLA , http://www.amazon.com/gp/product/B00815S5CG/ref=ox_ya_os_product_refresh_T1, $19.99/kg, It prints very well at 215 degrees and is a slightly translucent purple(its a pinkish purple). Spool is much taller than other brands
- Filimentoutlet through Amazon, http://www.amazon.com/gp/product/B00JQK5E42/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1.html, PLA, $18 -Have not tried printing with it yet but will update as information comes in.
- Proto-Pasta: https://www.proto-pasta.com/products/stainless-steel-pla
- Excellent review of PETG filament including filament from recycled PET bottles and a carabiner model for tensile testing: https://all3dp.com/1/petg-filament-3d-printing/?omhide=true&utm_source=Newsletter&utm_campaign=73b0c85b79-Newsletter&utm_medium=email&utm_term=0_9dffeeddae-73b0c85b79-399122217
- Inland is a company that seems to only sell in kilograms (at least on Amazon). Kilo price is slightly lower than other sellers and the filament can produce very good prints at reduced printing speed: https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=inland+pla+1.75&rh=i%3Aaps%2Ck%3Ainland+pla+1.75
- Great comparison of flexible filaments 
- FormFutura FlexiFil, https://www.formfutura.com/shop/category/flexible-materials-flexifiltm-tpe-163?search=&attrib=3-33, 29.55 Euros (netted $62 after tax and shipping) per 500g, From the manufacturer: "FlexiFil is a rubber-like high-performance and partially bio-based flexible TPC (Thermoplastic Co-Polyester) type of 3D printer filament." Expensive, ships from the Netherlands, and very prone to coming loose during printing. Highly recommend liberal use of glue stick and a first layer that would normally be too low - this has produced the best adhesion so far. Once adhesion is solved, prints very nicely with good dimensional accuracy and well balanced flexibility - stiffer with thicker layers. When using clear/natural with single thick walls, faster cooling = less clouded transparency.
Other commercial filaments
- bambooFill combines recycled bamboo fibers 20% with premium colorFabb PLA 80% to create natural looking, light-weight 3D printed objects.
- bronzeFill bronzeFill contains 80% finely ground bronze and 20% premium colorFabb PLA allowing heavy 3D printed objects that can be polished or oxidized to achieve the desired finish.
- copperFill copperFill contains 80% finely ground copper powder and 20% premium colorFabb PLA, and printed objects have great post-processing potential allowing heavy 3D printed objects that can be polished or oxidized to achieve the desired finish.
- woodFill combines recycled wood fibers 30% with premium colorFabb PLA 70% to create natural looking, light-weight 3D printed objects.
- 3D printing with metal 
Drying out filament