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Merci Electromu, c'est très clair pour moi maintenant

J'imprime principalement en PLA j'ai été amené a descendre la temp plateau à 45% et à démarrer plus bas dans Cura les ventilos notamment avec le Polymax

je me préparais à monter des ventilos centrifuges 35x35 12VDC ils démarrent encore beaucoup plus tard(24%) que les originaux, par contre après c'est top le flux est bien supérieur

Merci Electromu pour ton éclairage y a t-il un truc pour améliorer le démarrage, car si on s'en tient au réglage progressif du refroidissement dans Cura, il y a quelque couches qui sont passées avant que ce soit vraiment efficace ou alors tricher sur la hauteur de démarrage ?!

Merci darkdvd, moi aussi je ne suis pas très à l'aise dans ce domaine ta réponse m'a poussé à vérifier au multimètre, la tension est variable 10.3 à 1% jusqu'à 24V à 100% je trouve pas très normal cette difficulté au démarrage, c'est pas très net tout ça ! peut être que Electromu pourra expliquer

Bonjour à tous ! Pourquoi les ventilos sont ils branchés en série et non en parallèle ? y a t-il une raison bien précise ? (tout en connaissant la différence entre série et parallèle) J'avais remarqué depuis le début sur mon imprimante UM2 ext que les ventilos ne tournaient pas avant d'atteindre la valeur de 19 % environ indiquée sur le panel, par contre ils chantent bien dès le départ, et continuent à être "chantants" hélices tournantes quelque soit la vitesse. le fait de les brancher en parallèle changerait il quelque chose ? merci à vous

Hi BIKBart Thanks to you and to the other members for giving me the opportunity to share already some ideas, I had not plan doing that now, I wanted wait to go further before sharing. I feel less alone I don't have so much experiment in 3D print, just start in this field since January of this year It's my micro-mechanical designer experiment and passion that talk to me may be there are improvements to do..I still have to learn in the electronic and software side, Gcode etc..... since near six months my UM2 extended not + works well after some modifications, cooling fan duct, feeder( I use Bontech feeder), hot end fan cooling.... without issues, but I print mainly with the PLA material, it's easier ! Self-replicating machine would be great !

the centrifugal fan has only one side where the blow can come out as you can see in the picture, the blow comes straight out down in the arrow direction

Hi Didier Sorry for the confusion the latest design don't show the PTFE side, which is alway cooled by the 25x25 hot end fan the side centrifugal fans blow only on the printed surface around the nozzle tip the all duct fan body is clipped and can turn back to get a fast and easy access to the nozzle

Hi IRoberti First I take the opportunity to say to you that I'm one fan of your alternative feeder system The cenrifugal fans I have under hand are very clean, precise and good quality plastic body Delta electronics seems serious ( made in Thailand), there are even balance weights on the centrifugal impeller I think so that the centrifugal fan will give easier possiblities air flow managing in a small space Can't wait for testing !

Hi ultiarjan I have these centrifugal fan under hand, but not yet try these, I got fans from here : http://www.mouser.fr/Search/ProductDetail.aspx?qs=%2fW4LtXOBxKsfL3eA88psUg%3d%3d I need to assemble my custom print head before having a testing opportunity.

thanks ! we will have a lot discussion all together, I need to learn more about 3D printing technologies

no! it's not water cooling project, I plan to use a hight advanced plastic, I'm still in waiting to receive this material for machining a prototype, the hot end will keep the traditional cooling fan, this material I hope , will allow to replace in one piece the UM stock heat sink, the isolator and the PTFE, what will allow to get a maximum constant operating temp closed to 300° without degradation, that would be suited also to the PLA without sticking problems. I'll can speak more about it after testing. I followed with a great interest your UMO job( BTW here), OK with you about UM2 fans :( I plan to use 35x35 mm centrifugal fans for saving side places something like this

It's a good idea, but I desing now a full hot end too, I haven't an another printer but I own a turning and a milling machine I'll need more a solid printer base even used for customizing

Oh I know how you fell. I had the same problem when I did my magnetic dual head changer. Now with 3 printers it's painless to mod stuff. Yeah ! I am more& more passionate, I'll have to heat my credit card to another printer !

hi neotko yes of course ! you're right, it's in my mind, I own only one printer, I need to keep it operational for printing all these designs, it's a bit frustrating...

Thanks avogra it is not really possible to reduce the carriage size, but not so much in square looking from above the printer because of the bearing didacting, just only 2 mm more, 37mm square vs 35mm stock size, but in this second design, the bowden travel through the carriage is a lot shorter

The " build volume" would stays the same, just a bit offset on the right and front side if compare to before

You're right ! only the head XY support increase a bit in square, the goal is to re use the UM stock parts, sliding bearings, stock or Olsson heat block, isolator, PTFE etc...., and that will not needs any software modifications I currently test different designs before fixing the project Of course I'll share after testing the all things

Hi to all, hi BIKBart I had this idea too, here what I done in waiting to be assembled

" Something like 'weeeeeweeeeeweeeee'. Since I still have problem with not touching top layer I want to replace them completely " Hi to all, hi 3Dnerf The ends of diameter 8 shafts are centered with flanged bearings even if the pulley is not well centered, at least initially, it should not have a great impact on the layers height , the noise makes me doubt ... may be you should check the flanged bearing on the defective pulley side and if its seat has become oval following the pulley centering problem.