A keychain with your or your family/friends first name, written in individual letters, which form a flexible chain after printing. The chain is fun to fidget with :-).
Note that this model is print-in-place, so no support material is needed.

The models (.3mf) for more than 1200 first names are included. You can download them using the “Download .3mf” button. Press “download STL” above to see also the available SCAD file!

… and you can create your own:

Customizing

The names are configurable with OpenSCAD - it will create a custom STL for you! To do that, please install OpenSCAD on your own computer and follow the detailed customizing instructions below or follow these in depth instructions.

Print-in-place

The model does not need support material at all.

Credits

This re-uses some lines of code from the chainmail model from Openscaddad. Thank you!
Big thanks to IXPatch for the many cool pictures of his prints!

Share your make

If you could take a picture of an actual print, please "Comment" and attach the picture. - I am curious to see your uses in the wild! 
Also please leave a review with stars. If the option does not show up, make sure to download the model when you are logged in with your user and after a while the rating option will appear.

Other models

There are more configurable keychains available, the keychain-name-tag

the letter bead keychain

the wobbly letter cube keychain

the shopping cart coin

the chain of letters

the working keychain cannon

and the customizable bottle opener keychain:

There are more configurable-text-based creations available, like multi-line label, gadget display stand, bunting banner, customizable text box III, pyramid text, name plate, Customizable text box with lid and round text. Have also a look at my configurable pack of dogs, rabbits, reindeers and santas. There are also useful coat hangers and finger toys.

Please have a look at all my customizable creations. There are configurable-text-based creations, multi-line label, gadget display stand, sweeping name plate, bunting banner, customizable text box III, pyramid text, name plate, Customizable text box with lid and round text. Have also a look at my configurable pack of dogs, rabbits, reindeers and santas. There are also useful coat hangers and finger toys. Or just check out all my creations.

Have fun!

Detailed customizing instructions

• Download latest version of OpenSCAD, (See section "Development snapshots" at (https://www.openscad.org/downloads.html) )
• Download the "LetterChain_V9.scad" file from here.
• Open the .scad file in OpenSCAD.
• Change the variables to your liking:
  • To display the customizer, in the OpenSCAD "View" menu, the option called [Hide customizer] must be unselected.
  • Alternatively, change variables in the code: You find the variables in the beginning of the .SCAD file:
    If you want the same text on each side of the cubes:
    text="Chain";
• For fonts:
  • Set the fontname (and ensure you have that font installed on your system): fontname="Bangers";
  • The current font is “Blocktastic”, available online
• Press "F5" to get a quick preview.
• Press "F6" when you like the preview. This will render the geometry and takes a little time.
• Press "F7" to save the geometry to an .STL file.
• Slice and print the .STL file.

Some Fixes if you have issues with OpenSCAD:

1) Your font of choice is not found by OpenSCAD on your PC.

• In case you miss some fonts in OpenSCAD, download them from google: http://www.google.com/fonts
• e.g. for "Bangers" here: https://fonts.google.com/specimen/Bangers
• Install all the fonts you want to use. Then restart OpenSCAD.

2) OpenSCAD won't pick up newly installed fonts in C:/Windows/Fonts.

• In case new fonts are missing, put the font TTF files also in C:\Program Files/OpenSCAD/fonts/Liberation-2.00.1/ttf and restart OpenSCAD again.
• Alternatively, put them in C:\Program Files/OpenSCAD/fonts/Lib

Names included

Here I list all the Czech, German and English names availabe as STL files. The names are included here so people using this site find this print and the STL when searching for their name.

Aaron, Abigail, Adam, Adela, Adrian, Adrien, Agathe, Alan, Albert, Ales, Alex, Alexander, Alexandra, Alexandre, Alexia, Alexis, Alfred, Alice, Alicia, Amanda, Amandine, Amber, Amelie, Amy, Anais, Andre, Andrea, Andreas, Andrew, Aneta, Anette, Angela, Angelika, Anja, Anke, Ann, Anna, Anneliese, Annette, Anthony, Antje, Antoine, Arnaud, Arthur, Ashley, Astrid, Audrey, Aurelie, Aurelien, Aurore, Austin, Axel, Baptiste, Bara, Barbara, Bastien, Beate, Ben, Benjamin, Benoit, Bernd, Berndt, Bernhard, Bernt, Bettina, Betty, Beverly, Billy, Birgit, Björn, Bobby, Brandon, Brenda, Brian, Brigitte, Britta, Brittany, Bruce, Bryan, Bärbel, Camille, Carin, Carl, Carla, Carol, Caroline, Carolyn, Carsten, Catharina, Catherine, Cathrin, Catrin, Cecile, Cedric, Celia, Celine, Charles, Charlotte, Cheryl, Chiara, Chloe, Chris, Christa, Christel, Christian, Christiane, Christina, Christine, Christoph, Christopher, Claire, Clara, Claudia, Claus, Clemence, clement, Coline, Coralie, Corentin, Cornelia, Curt, Cynthia, Cyril, Dagmar, Damien, Daniel, Daniela, Danielle, David, Deborah, Debra, Denisa, Denise, Dennis, Detlef, Detlev, Diana, Diane, Dieter, Dirk, Dominick, Dominika, Donald, Donna, Dorian, Doris, Dorothy, Douglas, Dylan, Edith, Edward, Elena, Elfriede, Elias, Elijah, Elisa, Elisabeth, Elise, Eliska, Elizabeth, Elke, Ella, Ellie, Elodie, Elsa, Emeline, Emil, Emilia, Emilie, Emily, Emma, Enzo, Eric, Erica, Erich, Erika, Erna, Ernst, Erwan, Erwin, Estelle, Ethan, Eugene, Eva, Evelyn, Evzen, Fabien, Fanny, Filip, Finn, Florent, Florian, Frances, Francesco, Francois, Frank, Franz, Frida, Frieda, Friedrich, Fritz, Gabriel, Gabriele, Gaetan, Gary, Georg, George, Gerald, Gerd, Gerda, Gerhard, Gerhardt, Gert, Gertrud, Gisela, Gloria, Grace, Gregory, Gudrun, Guillaume, Günter, Günther, Hana, Hannah, Hannelore, Hans, Harald, Harold, Hartmut, Heather, Heidi, Heike, Heiko, Heinrich, Heinz, Helen, Helene, Helga, Helmut, Helmuth, Henry, Herbert, Hermann, Herta, Hertha, Hildegard, Holger, Honza, Horst, hugo, Ilse, Ines, Inge, Ingeborg, Ingo, Ingrid, Irmgard, Irmgart, Isabella, Ivonne, Jack, Jacob, Jacqueline, Jade, James, Jan, Jana, Janet, Janice, Jason, Jean, Jeanne, Jeffrey, Jennifer, Jens, Jeremy, Jerome, Jerry, Jesse, Jessica, Jirka, Jitka, Joachim, Joan, Joe, Joerg, Johann, Johanna, Johannes, John, Johnny, Jonathan, Jordan, Jose, Joseph, Joshua, Joyce, Juan, Judith, Judy, Julia, Julie, Julien, Juliette, Justin, Justine, Jutta, Jörg, Jörn, Jürgen, Kai, Karel, Karen, Karin, Karl, Karolina, Karsten, Katarina, Kate, Katharina, Katherine, Kathleen, Kathrin, Kathryn, Katie, Katja, Katrin, Katrina, Kayla, Keith, Kelly, Kenneth, Kerstin, Kevin, Kimberly, Kirsten, Klara, Klaudia, Klaus, Krista, Kristian, Kristina, Kristine, Kuba, Kurt, Kyle, Käte, Käthe, Laetitia, Larry, Lars, Laura, Lauren, Laurie, Laurine, Lawrence, Lea, Lena, Lenka, Leo, Leon, Liam, Lieselotte, Lina, Linda, Lisa, Logan, Loic, Lola, Lothar, Lou, Louis, Louise, Luca, lucas, Lucie, Lucy, Lukas, Madison, Maelle, Maeva, Maik, Maike, Manfred, Manon, Manuela, Marc, Marcel, Marco, Marcus, Marek, Maren, Margaret, Margarete, Margarethe, Margaux, Margot, Maria, Marianne, Marie, Marilyn, Marina, Marine, Mario, Marion, Mark, Marketa, Marko, Markus, Marlies, Marlis, Marta, Martha, Martin, Martina, Mary, Mathew, Mathias, Mathieu, Mathilde, Mathis, Matteo, Matthew, Matthias, Matthieu, Max, Maxence, Maxime, Megan, Mehdi, Meik, Meike, Melanie, Melissa, Mia, Michael, Michaela, Michal, Michelle, Mickael, Mike, Mila, Mohamed, Monica, Monika, Morgane, Nadin, Nadine, Nancy, Natalie, Nathan, Nicholas, nicolas, Nicole, Niels, Nikol, Nils, Nina, Noah, Noemie, Norbert, Oceane, Olaf, Oliver, Olivia, Ondra, Ophelie, Otto, Pamela, Patricia, Patrick, Paul, Pauline, Pavel, Pavlina, Peter, Petra, Philip, Philipp, Phillip, Phillipp, Pierre, Quentin, Rachel, Radek, Rainer, Ralf, Ralph, Randy, Raphael, Raymond, Rebecca, Regina, Reiner, Reinhardt, Remi, Renate, Rene, Richard, Rita, Robert, Robin, Roger, Rolf, Romain, Romane, Ronald, Rose, Rosemarie, Roy, Rudolf, Rudolph, Russell, Ruth, Ryan, Rüdiger, Sabine, Salome, Sam, Samantha, Samuel, Sandra, Sara, Sarah, Scott, Sean, Sebastian, Sebastien, Sharon, Shirley, Siegfried, Sigrid, Silke, Silvia, Simon, Simona, Sofia, Solene , Sonja, Sophia, Sophie, Stefan, Stefanie, Stephan, Stephanie, Stephen, Steven, Susan, Susanne, Sven, Swen, Sylvia, Tanja, Teresa, Terry, Theo, Theresa, Thibault, Thibaut, Thomas, Thorsten, Tim, Timm, Timothy, Tobias, Tom, Tomas, Tony, Torsten, Tristan, Tyler, Ulrich, Ulrike, Ursula, Ute, Uwe, Valentin, Valentine, Veronica, Victor, Victoria, Vincent, Virginia, Vojtech, Volker, Walter, Walther, Waltraud, Wayne, Werner, Wilfried, Wilhelm, Willi, William, Willie, Willy, Wolfgang, Yann, Yvonne, Zachary, Zoe, Zuzana.